1 | 'use strict';
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2 |
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3 | var FORMATS = {
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4 | y: getYear,
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5 | Y: getFullYear,
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6 | m: getMonth,
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7 | n: getMonthName,
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8 | f: getMonthFullName,
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9 | d: getDay,
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10 | H: getMilitaryHours,
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11 | I: getHours,
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12 | M: getMinutes,
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13 | S: getSeconds,
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14 | N: getMillisec,
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15 | w: getWeekday,
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16 | W: getFullWeekday,
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17 | p: getPeriod
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18 | };
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19 |
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20 | var PERIOD = {
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21 | AM: 'AM',
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22 | PM: 'PM'
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23 | };
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24 |
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25 | var WEEKS = {
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26 | ABB: [
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27 | 'Sun',
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28 | 'Mon',
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29 | 'Tue',
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30 | 'Wed',
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31 | 'Thu',
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32 | 'Fri',
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33 | 'Sat'
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34 | ],
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35 | FULL: [
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36 | 'Sunday',
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37 | 'Monday',
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38 | 'Tuesday',
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39 | 'Wednesday',
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40 | 'Thursday',
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41 | 'Friday',
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42 | 'Saturday'
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43 | ]
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44 | };
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45 |
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46 | var MONTHS = {
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47 | ABB: [
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48 | 'Jan',
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49 | 'Feb',
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50 | 'Mar',
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51 | 'Apr',
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52 | 'May',
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53 | 'Jun',
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54 | 'Jul',
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55 | 'Aug',
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56 | 'Sep',
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57 | 'Oct',
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58 | 'Nov',
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59 | 'Dec'
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60 | ],
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61 | FULL: [
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62 | 'January',
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63 | 'February',
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64 | 'March',
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65 | 'April',
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66 | 'May',
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67 | 'June',
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68 | 'July',
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69 | 'August',
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70 | 'September',
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71 | 'October',
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72 | 'November',
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73 | 'December'
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74 | ]
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75 | };
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76 |
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77 | var ONEDAY = 86400000;
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78 | var ONEHOUR = 3600000;
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79 |
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80 | function DateTime(now, defaultFormat) {
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81 | this._created = Date.now();
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82 | this._now = (now) ? new Date(now) : new Date();
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83 | this._delta = this._created - this._now.getTime();
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84 | this._defaultFormat = defaultFormat || null;
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85 | }
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86 |
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87 | DateTime.setWeekNames = function (names) {
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88 | for (var i = 0, len = names.length; i < len; i++) {
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89 | if (!names[i]) {
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90 | continue;
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91 | }
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92 | WEEKS.FULL[i] = names[i];
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93 | }
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94 | };
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95 |
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96 | DateTime.setShortWeekNames = function (names) {
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97 | for (var i = 0, len = names.length; i < len; i++) {
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98 | if (!names[i]) {
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99 | continue;
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100 | }
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101 | WEEKS.ABB[i] = names[i];
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102 | }
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103 | };
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104 |
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105 |
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106 |
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107 |
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108 | DateTime.setPeriod = function (period) {
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109 | if (period[0]) {
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110 | PERIOD.AM = period[0];
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111 | }
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112 | if (period[1]) {
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113 | PERIOD.PM = period[1];
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114 | }
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115 | };
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116 |
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117 | DateTime.setMonthNames = function (names) {
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118 | for (var i = 0, len = names.length; i < len; i++) {
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119 | if (!names[i]) {
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120 | continue;
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121 | }
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122 | MONTHS.FULL[i] = names[i];
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123 | }
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124 | };
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125 |
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126 | DateTime.setShortMonthNames = function (names) {
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127 | for (var i = 0, len = names.length; i < len; i++) {
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128 | if (!names[i]) {
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129 | continue;
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130 | }
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131 | MONTHS.ABB[i] = names[i];
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132 | }
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133 | };
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134 |
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135 | DateTime.prototype.format = function (format) {
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136 |
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137 | if (!format && this._defaultFormat) {
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138 | format = this._defaultFormat;
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139 | }
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140 |
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141 | var str = '';
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142 | for (var i = 0, len = format.length; i < len; i++) {
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143 | str += this._convert(format[i]);
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144 | }
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145 | return str;
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146 | };
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147 |
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148 | DateTime.prototype.now = function () {
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149 | return Date.now() - this._delta;
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150 | };
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151 |
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152 | DateTime.prototype.epoch = function () {
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153 | return Math.floor(this.getTime() / 1000);
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154 | };
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155 |
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156 | DateTime.prototype.getTime = function () {
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157 | return this._now.getTime();
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158 | };
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159 |
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160 | DateTime.prototype.offsetInDays = function (offset) {
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161 | var next = new Date(this._now);
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162 | next.setDate(next.getDate() + offset);
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163 | this._now = next;
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164 | this._updateDelta();
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165 | };
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166 |
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167 | DateTime.prototype.offsetInHours = function (offset) {
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168 | var next = new Date(this._now);
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169 | next.setHours(next.getHours() + offset);
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170 | this._now = next;
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171 | this._updateDelta();
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172 | };
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173 |
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174 | DateTime.prototype.getDatesInRange = function (dateObj) {
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175 |
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176 | if (dateObj instanceof DateTime) {
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177 | dateObj = dateObj._now;
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178 | }
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179 |
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180 | if (this.getTime() >= dateObj.getTime()) {
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181 | throw new Error('start time cannot be greater than the end time');
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182 | }
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183 |
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184 | var list = [];
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185 | var dir = (dateObj.getTime() >= this.getTime()) ? 1 : -1;
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186 | var diff = dateObj.getTime() - this.getTime() * dir;
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187 | var current = new DateTime(this._now);
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188 |
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189 | while (diff > 0) {
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190 | list.push(current);
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191 | var next = new DateTime(current.getTime());
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192 | next.offsetInDays(1 * dir);
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193 | current = next;
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194 | diff -= ONEDAY;
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195 | }
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196 |
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197 | return list;
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198 | };
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199 |
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200 | DateTime.prototype.getHoursInRange = function (dateObj) {
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201 |
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202 | if (dateObj instanceof DateTime) {
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203 | dateObj = dateObj._now;
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204 | }
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205 |
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206 | if (this._now.getTime() >= dateObj.getTime()) {
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207 | throw new Error('start time cannot be greater than the end time');
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208 | }
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209 |
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210 | var list = [];
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211 | var dir = (dateObj.getTime() >= this._now.getTime()) ? 1 : -1;
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212 | var diff = dateObj.getTime() - this._now.getTime() * dir;
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213 | var current = new DateTime(this._now);
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214 |
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215 | while (diff > 0) {
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216 | list.push(current);
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217 | var next = new DateTime(current.getTime());
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218 | next.offsetInHours(1 * dir);
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219 | current = next;
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220 | diff -= ONEHOUR;
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221 | }
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222 |
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223 | return list;
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224 | };
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225 |
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226 | DateTime.prototype._convert = function (formatFragment) {
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227 | var converter = FORMATS[formatFragment];
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228 |
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229 | if (converter) {
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230 | return converter(this._now);
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231 | }
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232 |
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233 |
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234 | return formatFragment;
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235 | };
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236 |
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237 | DateTime.prototype._updateDelta = function () {
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238 | this._delta = this._created - this._now.getTime();
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239 | };
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240 |
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241 | function getYear(d) {
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242 | var year = d.getFullYear().toString();
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243 | return year.substring(year.length - 2);
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244 | }
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245 |
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246 | function getFullYear(d) {
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247 | return d.getFullYear();
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248 | }
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249 |
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250 | function getMonth(d) {
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251 | return pad(d.getMonth() + 1);
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252 | }
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253 |
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254 | function getMonthName(d) {
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255 | return MONTHS.ABB[d.getMonth()];
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256 | }
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257 |
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258 | function getMonthFullName(d) {
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259 | return MONTHS.FULL[d.getMonth()];
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260 | }
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261 |
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262 | function getDay(d) {
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263 | return pad(d.getDate());
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264 | }
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265 |
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266 | function getMilitaryHours(d) {
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267 | return pad(d.getHours());
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268 | }
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269 |
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270 | function getHours(d) {
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271 | var h = d.getHours();
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272 | var hours = (h >= 12) ? h - 12 : h;
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273 | return pad(hours);
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274 | }
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275 |
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276 | function getMinutes(d) {
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277 | return pad(d.getMinutes());
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278 | }
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279 |
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280 | function getSeconds(d) {
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281 | return pad(d.getSeconds());
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282 | }
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283 |
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284 | function getMillisec(d) {
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285 | return mpad(d.getMilliseconds());
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286 | }
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287 |
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288 | function getWeekday(d) {
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289 | return WEEKS.ABB[d.getDay()];
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290 | }
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291 |
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292 | function getFullWeekday(d) {
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293 | return WEEKS.FULL[d.getDay()];
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294 | }
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295 |
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296 | function getPeriod(d) {
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297 | var hours = d.getHours();
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298 | if (hours < 12) {
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299 | return PERIOD.AM;
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300 | }
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301 | return PERIOD.PM;
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302 | }
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303 |
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304 | function pad(n) {
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305 | return (n < 10) ? '0' + n : n;
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306 | }
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307 |
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308 | function mpad(n) {
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309 | var padded = pad(n);
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310 | return (typeof padded === 'string' || padded < 100) ? '0' + padded : padded;
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311 | }
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312 |
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313 | module.exports = DateTime;
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