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Working with different timezones in Javascript


Working with different timezones in Javascript

By : user2172427
Date : October 23 2020, 08:10 PM
wish of those help I am working on a cloud based application which deals extensively with date and time values, for users across the world. , First, let's talk about the code in your question.
code :
let india_date = new Date()
let uts_ms = india_date.getTime() + india_date.getTimezoneOffset()
let california_ms = utc_ms + getCaliforniaTimezoneOffsetMS()
let california_date: Date = new Date(california_ms)


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Working with timezones and daylight savings time in Javascript

Working with timezones and daylight savings time in Javascript


By : user2701583
Date : March 29 2020, 07:55 AM
will be helpful for those in need 2 is a bad idea since, as you pointed out, it increases load times. If I were you I would do a combination of 1 and 3. I don't agree that this makes the JSON data messy or the REST interface non-optimal.
This is a classic tradeoff where to accept a bit more complexity in the protocol in order to simplify the client-side code.
iCal4j Timezones not compatible with Microsoft Outlook Timezones?

iCal4j Timezones not compatible with Microsoft Outlook Timezones?


By : anshul
Date : March 29 2020, 07:55 AM
This might help you Have you tried just quoting the existing TZID param (i.e. without changing it to "Eastern Standard Time")? For example:
code :
BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Ben Fortuna//iCal4j 1.0//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
BEGIN:VEVENT
DTSTAMP:20120808T211508Z
DTSTART;TZID="America/New_York":20120808T020000
DTEND;TZID="America/New_York":20120808T180000
...
The Trouble with Timezones - all timezones are local timezones?

The Trouble with Timezones - all timezones are local timezones?


By : user2247402
Date : March 29 2020, 07:55 AM
wish help you to fix your issue timetuple() (and all other struct-tm-based functions) throw away the timezone information; i.e., the time tuple data structure simply doesn't have a timezone field. It is intended for breaking down a datetime into its component display fields, so it was never really designed for computation on time values. Keep your value in datetime format as much as possible.
code :
>>> datetime.datetime(1970, 01, 01, 0, 0, 0, tzinfo=utc)
datetime.datetime(1970, 1, 1, 0, 0, tzinfo=<UTC>)
>>> datetime.datetime(1970, 01, 01, 0, 0, 0, tzinfo=utc).timetuple()
time.struct_time(tm_year=1970, tm_mon=1, tm_mday=1, tm_hour=0, tm_min=0, tm_sec=0, tm_wday=3, tm_yday=1, tm_isdst=0)
>>> now = mst.localize(datetime.datetime(1970, 01, 01, 0, 0, 0))
>>> now
datetime.datetime(1970, 1, 1, 0, 0, tzinfo=<DstTzInfo 'US/Mountain' MST-1 day, 17:00:00 STD>)
>>> now.astimezone(est)
datetime.datetime(1970, 1, 1, 2, 0, tzinfo=<DstTzInfo 'US/Eastern' EST-1 day, 19:00:00 STD>)
PHP & MySQL Timezones whilst supporting user-defined timezones

PHP & MySQL Timezones whilst supporting user-defined timezones


By : Jonny
Date : March 29 2020, 07:55 AM
wish help you to fix your issue MySQL's data type timestamp stores the dates in UTC. For this to work properly, MySQL uses server's time zone and does the date conversion. It converts the date from servers's current time zone to UTC for storage. This implies that the database server should never change its time zone for this feature to work properly.
When you send the data to such a database, you send the UTC time as well. The easiest way to do this is to format a result of time() according to what MySQL wants (m-d-Y H:i:s).
code :
$date = '1.12.2015 13:37:37'; // Format is day.month.year hour:minute:second

// We create DateTime from custom date format, for the person who resides in Australia/Sydney time zone
$dt = DateTime::createFromFormat('d.m.Y H:i:s', $date, new DateTimeZone('Australia/Sydney'); 

// Now we change the date's time zone into UTC, and we can insert it into MySQL
$dt->setTimeZone(new DateTimeZone('UTC'));

// This is the formatted date-string that can be safely inserted into MySQL
$date_string_for_mysql = $dt->format('m-d-Y H:i:s');
How to store and display working hours for different timezones correctly in javascript?

How to store and display working hours for different timezones correctly in javascript?


By : Slenderman
Date : March 29 2020, 07:55 AM
Does that help As I posted above momentjs and moment-timezone were suboptimal and couldn't get them figure out well. I ended up using luxon, by far the easiest library to manipulate time and dates.
Apart from regular npm installation, typing files are also necessary:
code :
npm i luxon --save
npm i @types/luxon --save-dev
import {DateTime, Interval} from 'luxon';
getHours(date: Date) {
  const hours: DateTime[] = [];
  // Convert user date to local date
  const userSelectedDate = this.userDate(date);
  const serviceLocalTime = userSelectedDate.toUTC().setZone(service_ZONE),
        // Set working hours for the date
        serviceWorkStart = serviceLocalTime.set(service_OBJECT),
        serviceWorkEnd = serviceLocalTime.set(service_OBJECT).plus({hour: TOTAL_WORKING_HOURS});
        // Convert back to user date with hours
  const userWorkStart = serviceWorkStart.toLocal(),
        userWorkEnd = serviceWorkEnd.toLocal(),
        userWorkingHours = Interval.fromDateTimes(userWorkStart, userWorkEnd).divideEqually(TOTAL_WORKING_HOURS);
  userWorkingHours.forEach(hour => {
    if (hour.start.day < userSelectedDate.day) {
      const dayUp = hour.start.plus({day: 1});
      if (dayUp.toUTC().setZone(service_ZONE).weekday === 3 || dayUp.toUTC().setZone(service_ZONE).weekday === 7) {
        // Day-offs are not added to the list
      } else { hours.push(dayUp); }
    } else {
      if (hour.start.toUTC().setZone(service_ZONE).weekday === 3 || hour.start.toUTC().setZone(service_ZONE).weekday === 7) {
        // Day-offs are not added to the list
      } else { hours.push(hour.start); }
    }
  });
  return hours.sort((a, b) => a.hour - b.hour);
}
selectDate(e: MatDatepickerInputEvent<Date>) {
    this.selectedDateHours = [];
    if (this.bookForm.controls.date.invalid) {
      this.bookForm.controls.hours.reset();
      this.selectDisabled = true;
    } else {
      this.selectDisabled = false;
      const dateInput = this.dtService.getHours(e.target.value);
      dateInput.forEach(hour => {
        if (this.table.some(booking => booking.hour === hour.toUTC().toISO())) {
          this.selectedDateHours.push({hour: hour, booked: true});
        } else {
          this.selectedDateHours.push({hour: hour, booked: false});
        }
      });
    }
  }
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