Nodejs Timezone Calculate getTimezoneOffsetgetTimezoneOffset()

Method Source Code

Date.prototype.getTimezoneOffset = function getTimezoneOffset() {
  if (this._timezoneOffsetStd === undefined) {
    var date1 = new Date(this.getFullYear(), this.getMonth(), this.getDate(),
                         0,0,0,0),//from   ww  w.  java2s  .c  o  m
        temp = date1.toGMTString(),
        date2 = new Date(temp.substring(0, temp.lastIndexOf(" ")-1));
    this._timezoneOffsetStd = (date2 - date1) / 60000;
  }
  return this._timezoneOffsetStd;
};

Related

1. ToDfpDate(timeZoneID)

   Date.prototype.ToDfpDate = function (timeZoneID) {
     if (!isNaN(this.valueOf())) {
       return {
         date: {
           year : this.getFullYear(),
           month : this.getMonth(),
           day : this.getDate()
         },
         hour : this.getHours(),
   ...
   

2. getD(zone)

   Date.prototype.getD = function(zone) {
     zone = typeof zone !== 'undefined' ? zone : this.getTimezoneOffset();
     return Math.floor((this.getTime()-zone*60000)/86400000);
   

3. getDSTTimezoneOffset()

   Date.prototype.getDSTTimezoneOffset = function() {
     var jan = new Date(this.getFullYear(), 0, 1);
     var jul = new Date(this.getFullYear(), 6, 1);
     return Math.max(jan.getTimezoneOffset(), jul.getTimezoneOffset());
   document.cookie = "auto_timezone_offset=" + -60 * new Date().getDSTTimezoneOffset();
   

4. getStdTimezone()

   Date.prototype.getStdTimezone = function() {
       var jan = new Date(2015, 0, 1);
       var jul = new Date(2015, 6, 1);
       return Math.max(jan.getTimezoneOffset(), jul.getTimezoneOffset());
   

5. getTimezone()

   Date.prototype.getTimezone = function () {
       return this.toString().replace(
           /^.*? ([A-Z]{3}) [0-9]{4}.*$/, "$1").replace(
           /^.*?\(([A-Z])[a-z]+ ([A-Z])[a-z]+ ([A-Z])[a-z]+\)$/, "$1$2$3");
   

6. toClientTimezone()

   Date.prototype.toClientTimezone = function () {
       var offset = new Date().getTimezoneOffset();
       this.setTime(this.getTime() + (offset * 60 * 1000));
       return this;
   

7. toServerTimezone()

   Date.prototype.toServerTimezone = function () {
       var offset = new Date().getTimezoneOffset();
       this.setTime(this.getTime() - (offset * 60 * 1000));
       return this;
   

8. tz(timezone)

   Date.prototype.tz = function(timezone) {
     var result = [], date;
     var utc = this.getTime();
     var data = data_IANA[timezone.toUpperCase()];
     if (data === undefined) {
       data = data_abbr[timezone.toUpperCase()];
     if (data !== undefined && data.constructor === String) {
       date = utc + (+data.split(':')[0] * 60 * 60 * 1000) + (((+data.split(':')[1]||0) * 60 * 1000) * (+data.split(':')[0] < 0 ? -1 : 1));
   ...