Calendar showing false day of week for dates when timezone is negative

[Harry-33]

Hi,
there is an issue with the calendar module in MetroUI when running in environments with negative time zone (UTC-01:00 to -XX).

You can see it also on the demo page:

1. Open Demo page: https://metroui.org.ua/calendar.html --> you will see everything is correct (if timezone is UTC or UTC+)
2. Change timezone to UTC- (e.g. for Central Time UTC-06:00)
3. Open demo page again: https://metroui.org.ua/calendar.html
   You will note that the days in the calendar are off by one day.
   Interestingly old versions of MetroUI (e.g. V3) didn't have the issue:
   (Note: Today is Thursday - the 9th of February 2023)
   current metro version:
   old metro version:
   

Does anyone knows a workaround for that?

Thx in advance!

[Harry-33]

Found a workaround for that - if someone also encounters this issue:
(metro.js - starting at line 83:)
instead of:
Datetime = function(){ var args = [].slice.call(arguments); this.value = new (Function.prototype.bind.apply(Date, [this].concat(args) ) ); this.locale = "en"; this.weekStart = global['DATETIME_LOCALES']["en"].weekStart; this.utcMode = true; this.mutable = true;
do the following:
var args = [].slice.call(arguments); this.value = new (Function.prototype.bind.apply(Date, [this].concat(args) ) ); this.locale = "en"; this.weekStart = global['DATETIME_LOCALES']["en"].weekStart; this.utcMode = true; //default value if(new Date().getTimezoneOffset() > 0) //gettimezoneoffset { this.utcMode = true;(workaround?) } else { this.utcMode = false; } this.mutable = true;
Harry