Have multiple clocks showing multiple timezones

[wojtekmaj]

Have multiple clocks showing multiple timezones

[wojtekmaj]

Date in JavaScript doesn't have a concept of timezones really, it only uses local time and allows to get local and/or UTC string out of it if needed. This makes displaying time from non-local timezone very tricky.

So for example if you're in London, and would like to show clocks from UTC and UTC+1, you would use:

• new Date() for your current time (UTC)
• Something like new Date(new Date().toISOString().slice(0, -1) + '-01:00') for UTC+1. Why? We're looking for a date which, when read as our local time, will return a time an hour later than our current one.