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There’s a few options, though there’s not a PHP Class or Function that will automatically do it for you.
GeoIP
Use GeoIP and location-based matching to match the IP to a zone. The downside here, as with many solutions, is that if they are using a VPN or Proxy, it will show the zone of the VPN or Proxy IP, not the users physical IP that’s behind it.
User Data
Have the user provide their timezone and you can do conversions against GMT.
Javascript
Javascript is client-side, though much like GeoIP, if the client is behind a VPN or Proxy, the same issue persists. You won’t be displaying the timezone of the user, you’ll be displaying the timezone of the VPN or Proxy.
Download and store countries and timezones in database.
get client IP address in PHP
then Get Country name
Search timezone in database
Full solution : https://www.edanesh.com/article/How-to-detect-users-timezone-in-php