How to compare client and server time with different timezones?

Question

PHP

It is necessary to compare the time data that is generated on the server and that comes from the client. How to work with this time, the time zone will come along with the client's request.

Answer 1

you need to convert all the time to one time zone for example UTC and then compare.
javascript get date in UTC

Answer 2

if I'm not mistaken, you will have all the time from the server, in order to get the client's time, then you need to generate it using client tools, for example, javascript (but you need to take into account that the client may not have the correct time relative to the world time, not everything in the same example correctly indicates the time zone in the operating system )