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annotate geotemco/lib/simile/ajax/scripts/date-time.js @ 23:a879f6b9d166

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author Zoe Hong <zhong@mpiwg-berlin.mpg.de>
date Wed, 25 Feb 2015 10:59:45 +0100
parents b12c99b7c3f0
children
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1 /**
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2 * @fileOverview A collection of date/time utility functions
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3 * @name SimileAjax.DateTime
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4 */
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5
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6 SimileAjax.DateTime = new Object();
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7
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8 SimileAjax.DateTime.MILLISECOND = 0;
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9 SimileAjax.DateTime.SECOND = 1;
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10 SimileAjax.DateTime.MINUTE = 2;
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11 SimileAjax.DateTime.HOUR = 3;
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12 SimileAjax.DateTime.DAY = 4;
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13 SimileAjax.DateTime.WEEK = 5;
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14 SimileAjax.DateTime.MONTH = 6;
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15 SimileAjax.DateTime.YEAR = 7;
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16 SimileAjax.DateTime.DECADE = 8;
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17 SimileAjax.DateTime.CENTURY = 9;
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18 SimileAjax.DateTime.MILLENNIUM = 10;
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19
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20 SimileAjax.DateTime.EPOCH = -1;
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21 SimileAjax.DateTime.ERA = -2;
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22
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23 /**
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24 * An array of unit lengths, expressed in milliseconds, of various lengths of
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25 * time. The array indices are predefined and stored as properties of the
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26 * SimileAjax.DateTime object, e.g. SimileAjax.DateTime.YEAR.
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27 * @type Array
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28 */
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29 SimileAjax.DateTime.gregorianUnitLengths = [];
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30 (function() {
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31 var d = SimileAjax.DateTime;
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32 var a = d.gregorianUnitLengths;
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33
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34 a[d.MILLISECOND] = 1;
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35 a[d.SECOND] = 1000;
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36 a[d.MINUTE] = a[d.SECOND] * 60;
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37 a[d.HOUR] = a[d.MINUTE] * 60;
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38 a[d.DAY] = a[d.HOUR] * 24;
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39 a[d.WEEK] = a[d.DAY] * 7;
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40 a[d.MONTH] = a[d.DAY] * 31;
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41 a[d.YEAR] = a[d.DAY] * 365;
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42 a[d.DECADE] = a[d.YEAR] * 10;
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43 a[d.CENTURY] = a[d.YEAR] * 100;
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44 a[d.MILLENNIUM] = a[d.YEAR] * 1000;
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45 })();
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46
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47 SimileAjax.DateTime._dateRegexp = new RegExp(
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48 "^(-?)([0-9]{4})(" + [
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49 "(-?([0-9]{2})(-?([0-9]{2}))?)", // -month-dayOfMonth
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50 "(-?([0-9]{3}))", // -dayOfYear
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51 "(-?W([0-9]{2})(-?([1-7]))?)" // -Wweek-dayOfWeek
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52 ].join("|") + ")?$"
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53 );
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54 SimileAjax.DateTime._timezoneRegexp = new RegExp(
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55 "Z|(([-+])([0-9]{2})(:?([0-9]{2}))?)$"
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56 );
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57 SimileAjax.DateTime._timeRegexp = new RegExp(
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58 "^([0-9]{2})(:?([0-9]{2})(:?([0-9]{2})(\.([0-9]+))?)?)?$"
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59 );
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60
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61 /**
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62 * Takes a date object and a string containing an ISO 8601 date and sets the
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63 * the date using information parsed from the string. Note that this method
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64 * does not parse any time information.
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65 *
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66 * @param {Date} dateObject the date object to modify
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67 * @param {String} string an ISO 8601 string to parse
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68 * @return {Date} the modified date object
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69 */
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70 SimileAjax.DateTime.setIso8601Date = function(dateObject, string) {
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71 /*
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72 * This function has been adapted from dojo.date, v.0.3.0
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73 * http://dojotoolkit.org/.
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74 */
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75
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76 var d = string.match(SimileAjax.DateTime._dateRegexp);
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77 if(!d) {
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78 throw new Error("Invalid date string: " + string);
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79 }
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80
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81 var sign = (d[1] == "-") ? -1 : 1; // BC or AD
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82 var year = sign * d[2];
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83 var month = d[5];
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84 var date = d[7];
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85 var dayofyear = d[9];
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86 var week = d[11];
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87 var dayofweek = (d[13]) ? d[13] : 1;
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88
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89 dateObject.setUTCFullYear(year);
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90 if (dayofyear) {
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91 dateObject.setUTCMonth(0);
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92 dateObject.setUTCDate(Number(dayofyear));
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93 } else if (week) {
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94 dateObject.setUTCMonth(0);
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95 dateObject.setUTCDate(1);
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96 var gd = dateObject.getUTCDay();
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97 var day = (gd) ? gd : 7;
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98 var offset = Number(dayofweek) + (7 * Number(week));
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99
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100 if (day <= 4) {
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101 dateObject.setUTCDate(offset + 1 - day);
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102 } else {
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103 dateObject.setUTCDate(offset + 8 - day);
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104 }
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105 } else {
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106 if (month) {
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107 dateObject.setUTCDate(1);
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108 dateObject.setUTCMonth(month - 1);
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109 }
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110 if (date) {
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111 dateObject.setUTCDate(date);
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112 }
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113 }
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114
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115 return dateObject;
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116 };
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117
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118 /**
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119 * Takes a date object and a string containing an ISO 8601 time and sets the
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120 * the time using information parsed from the string. Note that this method
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121 * does not parse any date information.
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122 *
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123 * @param {Date} dateObject the date object to modify
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124 * @param {String} string an ISO 8601 string to parse
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125 * @return {Date} the modified date object
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126 */
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127 SimileAjax.DateTime.setIso8601Time = function (dateObject, string) {
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128 /*
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129 * This function has been adapted from dojo.date, v.0.3.0
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130 * http://dojotoolkit.org/.
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131 */
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132
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133 var d = string.match(SimileAjax.DateTime._timeRegexp);
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134 if(!d) {
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135 SimileAjax.Debug.warn("Invalid time string: " + string);
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136 return false;
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137 }
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138 var hours = d[1];
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139 var mins = Number((d[3]) ? d[3] : 0);
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140 var secs = (d[5]) ? d[5] : 0;
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141 var ms = d[7] ? (Number("0." + d[7]) * 1000) : 0;
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142
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143 dateObject.setUTCHours(hours);
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144 dateObject.setUTCMinutes(mins);
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145 dateObject.setUTCSeconds(secs);
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146 dateObject.setUTCMilliseconds(ms);
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147
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148 return dateObject;
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149 };
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150
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151 /**
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152 * The timezone offset in minutes in the user's browser.
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153 * @type Number
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154 */
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155 SimileAjax.DateTime.timezoneOffset = new Date().getTimezoneOffset();
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156
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157 /**
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158 * Takes a date object and a string containing an ISO 8601 date and time and
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159 * sets the date object using information parsed from the string.
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160 *
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161 * @param {Date} dateObject the date object to modify
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162 * @param {String} string an ISO 8601 string to parse
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163 * @return {Date} the modified date object
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164 */
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165 SimileAjax.DateTime.setIso8601 = function (dateObject, string){
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166 /*
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167 * This function has been adapted from dojo.date, v.0.3.0
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168 * http://dojotoolkit.org/.
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169 */
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170
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171 var offset = null;
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172 var comps = (string.indexOf("T") == -1) ? string.split(" ") : string.split("T");
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173
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174 SimileAjax.DateTime.setIso8601Date(dateObject, comps[0]);
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175 if (comps.length == 2) {
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176 // first strip timezone info from the end
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177 var d = comps[1].match(SimileAjax.DateTime._timezoneRegexp);
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178 if (d) {
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179 if (d[0] == 'Z') {
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180 offset = 0;
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181 } else {
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182 offset = (Number(d[3]) * 60) + Number(d[5]);
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183 offset *= ((d[2] == '-') ? 1 : -1);
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184 }
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185 comps[1] = comps[1].substr(0, comps[1].length - d[0].length);
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186 }
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187
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188 SimileAjax.DateTime.setIso8601Time(dateObject, comps[1]);
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189 }
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190 if (offset == null) {
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191 offset = dateObject.getTimezoneOffset(); // local time zone if no tz info
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192 }
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193 dateObject.setTime(dateObject.getTime() + offset * 60000);
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194
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195 return dateObject;
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196 };
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197
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198 /**
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199 * Takes a string containing an ISO 8601 date and returns a newly instantiated
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200 * date object with the parsed date and time information from the string.
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201 *
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202 * @param {String} string an ISO 8601 string to parse
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203 * @return {Date} a new date object created from the string
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204 */
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205 SimileAjax.DateTime.parseIso8601DateTime = function (string) {
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206 try {
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207 return SimileAjax.DateTime.setIso8601(new Date(0), string);
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208 } catch (e) {
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209 return null;
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210 }
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211 };
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212
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213 /**
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214 * Takes a string containing a Gregorian date and time and returns a newly
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215 * instantiated date object with the parsed date and time information from the
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216 * string. If the param is actually an instance of Date instead of a string,
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217 * simply returns the given date instead.
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218 *
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219 * @param {Object} o an object, to either return or parse as a string
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220 * @return {Date} the date object
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221 */
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222 SimileAjax.DateTime.parseGregorianDateTime = function(o) {
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223 if (o == null) {
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224 return null;
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225 } else if (o instanceof Date) {
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226 return o;
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227 }
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228
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229 var s = o.toString();
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230 if (s.length > 0 && s.length < 8) {
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231 var space = s.indexOf(" ");
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232 if (space > 0) {
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233 var year = parseInt(s.substr(0, space));
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234 var suffix = s.substr(space + 1);
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235 if (suffix.toLowerCase() == "bc") {
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236 year = 1 - year;
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237 }
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238 } else {
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239 var year = parseInt(s);
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240 }
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241
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242 var d = new Date(0);
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243 d.setUTCFullYear(year);
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244
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245 return d;
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246 }
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247
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248 try {
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249 return new Date(Date.parse(s));
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250 } catch (e) {
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251 return null;
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252 }
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253 };
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254
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255 /**
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256 * Rounds date objects down to the nearest interval or multiple of an interval.
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257 * This method modifies the given date object, converting it to the given
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258 * timezone if specified.
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259 *
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260 * @param {Date} date the date object to round
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261 * @param {Number} intervalUnit a constant, integer index specifying an
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262 * interval, e.g. SimileAjax.DateTime.HOUR
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263 * @param {Number} timeZone a timezone shift, given in hours
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264 * @param {Number} multiple a multiple of the interval to round by
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265 * @param {Number} firstDayOfWeek an integer specifying the first day of the
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266 * week, 0 corresponds to Sunday, 1 to Monday, etc.
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267 */
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268 SimileAjax.DateTime.roundDownToInterval = function(date, intervalUnit, timeZone, multiple, firstDayOfWeek) {
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269 var timeShift = timeZone *
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270 SimileAjax.DateTime.gregorianUnitLengths[SimileAjax.DateTime.HOUR];
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271
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272 var date2 = new Date(date.getTime() + timeShift);
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273 var clearInDay = function(d) {
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274 d.setUTCMilliseconds(0);
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275 d.setUTCSeconds(0);
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276 d.setUTCMinutes(0);
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277 d.setUTCHours(0);
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278 };
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279 var clearInYear = function(d) {
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280 clearInDay(d);
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281 d.setUTCDate(1);
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282 d.setUTCMonth(0);
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283 };
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284
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285 switch(intervalUnit) {
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286 case SimileAjax.DateTime.MILLISECOND:
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287 var x = date2.getUTCMilliseconds();
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288 date2.setUTCMilliseconds(x - (x % multiple));
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289 break;
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290 case SimileAjax.DateTime.SECOND:
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291 date2.setUTCMilliseconds(0);
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292
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293 var x = date2.getUTCSeconds();
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294 date2.setUTCSeconds(x - (x % multiple));
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295 break;
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296 case SimileAjax.DateTime.MINUTE:
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297 date2.setUTCMilliseconds(0);
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298 date2.setUTCSeconds(0);
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299
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300 var x = date2.getUTCMinutes();
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301 date2.setTime(date2.getTime() -
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302 (x % multiple) * SimileAjax.DateTime.gregorianUnitLengths[SimileAjax.DateTime.MINUTE]);
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303 break;
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304 case SimileAjax.DateTime.HOUR:
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305 date2.setUTCMilliseconds(0);
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306 date2.setUTCSeconds(0);
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307 date2.setUTCMinutes(0);
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308
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309 var x = date2.getUTCHours();
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310 date2.setUTCHours(x - (x % multiple));
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311 break;
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312 case SimileAjax.DateTime.DAY:
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313 clearInDay(date2);
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314 break;
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315 case SimileAjax.DateTime.WEEK:
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316 clearInDay(date2);
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317 var d = (date2.getUTCDay() + 7 - firstDayOfWeek) % 7;
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318 date2.setTime(date2.getTime() -
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319 d * SimileAjax.DateTime.gregorianUnitLengths[SimileAjax.DateTime.DAY]);
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320 break;
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321 case SimileAjax.DateTime.MONTH:
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322 clearInDay(date2);
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323 date2.setUTCDate(1);
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324
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325 var x = date2.getUTCMonth();
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326 date2.setUTCMonth(x - (x % multiple));
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327 break;
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328 case SimileAjax.DateTime.YEAR:
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329 clearInYear(date2);
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330
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331 var x = date2.getUTCFullYear();
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332 date2.setUTCFullYear(x - (x % multiple));
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333 break;
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334 case SimileAjax.DateTime.DECADE:
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335 clearInYear(date2);
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336 date2.setUTCFullYear(Math.floor(date2.getUTCFullYear() / 10) * 10);
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337 break;
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338 case SimileAjax.DateTime.CENTURY:
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339 clearInYear(date2);
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340 date2.setUTCFullYear(Math.floor(date2.getUTCFullYear() / 100) * 100);
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341 break;
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342 case SimileAjax.DateTime.MILLENNIUM:
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343 clearInYear(date2);
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344 date2.setUTCFullYear(Math.floor(date2.getUTCFullYear() / 1000) * 1000);
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345 break;
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346 }
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347
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348 date.setTime(date2.getTime() - timeShift);
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349 };
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350
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351 /**
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352 * Rounds date objects up to the nearest interval or multiple of an interval.
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353 * This method modifies the given date object, converting it to the given
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354 * timezone if specified.
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355 *
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356 * @param {Date} date the date object to round
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357 * @param {Number} intervalUnit a constant, integer index specifying an
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358 * interval, e.g. SimileAjax.DateTime.HOUR
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359 * @param {Number} timeZone a timezone shift, given in hours
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360 * @param {Number} multiple a multiple of the interval to round by
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361 * @param {Number} firstDayOfWeek an integer specifying the first day of the
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362 * week, 0 corresponds to Sunday, 1 to Monday, etc.
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363 * @see SimileAjax.DateTime.roundDownToInterval
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364 */
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365 SimileAjax.DateTime.roundUpToInterval = function(date, intervalUnit, timeZone, multiple, firstDayOfWeek) {
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366 var originalTime = date.getTime();
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367 SimileAjax.DateTime.roundDownToInterval(date, intervalUnit, timeZone, multiple, firstDayOfWeek);
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368 if (date.getTime() < originalTime) {
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369 date.setTime(date.getTime() +
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370 SimileAjax.DateTime.gregorianUnitLengths[intervalUnit] * multiple);
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371 }
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372 };
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373
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374 /**
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375 * Increments a date object by a specified interval, taking into
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376 * consideration the timezone.
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377 *
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378 * @param {Date} date the date object to increment
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379 * @param {Number} intervalUnit a constant, integer index specifying an
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380 * interval, e.g. SimileAjax.DateTime.HOUR
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381 * @param {Number} timeZone the timezone offset in hours
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382 */
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383 SimileAjax.DateTime.incrementByInterval = function(date, intervalUnit, timeZone) {
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384 timeZone = (typeof timeZone == 'undefined') ? 0 : timeZone;
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385
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386 var timeShift = timeZone *
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387 SimileAjax.DateTime.gregorianUnitLengths[SimileAjax.DateTime.HOUR];
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388
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389 var date2 = new Date(date.getTime() + timeShift);
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390
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391 switch(intervalUnit) {
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392 case SimileAjax.DateTime.MILLISECOND:
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393 date2.setTime(date2.getTime() + 1)
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394 break;
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395 case SimileAjax.DateTime.SECOND:
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396 date2.setTime(date2.getTime() + 1000);
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397 break;
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398 case SimileAjax.DateTime.MINUTE:
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399 date2.setTime(date2.getTime() +
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400 SimileAjax.DateTime.gregorianUnitLengths[SimileAjax.DateTime.MINUTE]);
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401 break;
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402 case SimileAjax.DateTime.HOUR:
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403 date2.setTime(date2.getTime() +
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404 SimileAjax.DateTime.gregorianUnitLengths[SimileAjax.DateTime.HOUR]);
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405 break;
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406 case SimileAjax.DateTime.DAY:
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407 date2.setUTCDate(date2.getUTCDate() + 1);
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408 break;
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409 case SimileAjax.DateTime.WEEK:
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410 date2.setUTCDate(date2.getUTCDate() + 7);
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411 break;
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412 case SimileAjax.DateTime.MONTH:
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413 date2.setUTCMonth(date2.getUTCMonth() + 1);
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414 break;
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415 case SimileAjax.DateTime.YEAR:
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416 date2.setUTCFullYear(date2.getUTCFullYear() + 1);
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417 break;
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418 case SimileAjax.DateTime.DECADE:
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419 date2.setUTCFullYear(date2.getUTCFullYear() + 10);
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420 break;
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421 case SimileAjax.DateTime.CENTURY:
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422 date2.setUTCFullYear(date2.getUTCFullYear() + 100);
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423 break;
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424 case SimileAjax.DateTime.MILLENNIUM:
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425 date2.setUTCFullYear(date2.getUTCFullYear() + 1000);
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426 break;
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427 }
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428
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429 date.setTime(date2.getTime() - timeShift);
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430 };
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431
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432 /**
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433 * Returns a new date object with the given time offset removed.
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434 *
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435 * @param {Date} date the starting date
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436 * @param {Number} timeZone a timezone specified in an hour offset to remove
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437 * @return {Date} a new date object with the offset removed
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438 */
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439 SimileAjax.DateTime.removeTimeZoneOffset = function(date, timeZone) {
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440 return new Date(date.getTime() +
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441 timeZone * SimileAjax.DateTime.gregorianUnitLengths[SimileAjax.DateTime.HOUR]);
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442 };
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443
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444 /**
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445 * Returns the timezone of the user's browser.
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446 *
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447 * @return {Number} the timezone in the user's locale in hours
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448 */
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449 SimileAjax.DateTime.getTimezone = function() {
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450 var d = new Date().getTimezoneOffset();
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451 return d / -60;
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452 };