Set it up in Slack or give it a try below:

/tz
↵  
  • Chicago, US: 12:23 am CDT, Sun Mar 26th
  • Chicago is 1 hour behind you
  • Los Angeles, US: 10:23 pm PDT, Sat Mar 25th
  • Los Angeles is 3 hours behind you
  • Paris, FR: 7:23 am CEST, Sun Mar 26th
  • Paris is 6 hours ahead of you
  • Mumbai, IN: 10:53 am IST, Sun Mar 26th
  • Mumbai is 9.5 hours ahead of you
  • Chicago is 2 hours ahead of Los Angeles
  • Chicago is 7 hours behind Paris
  • Chicago is 10.5 hours behind Mumbai

Examples: