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

/tz
↵  
  • Chicago, US: 10:52 am CDT, Thu Mar 28th
  • Chicago is 1 hour behind you
  • Los Angeles, US: 8:52 am PDT, Thu Mar 28th
  • Los Angeles is 3 hours behind you
  • Paris, FR: 4:52 pm CET, Thu Mar 28th
  • Paris is 5 hours ahead of you
  • Mumbai, IN: 9:22 pm IST, Thu Mar 28th
  • Mumbai is 9.5 hours ahead of you
  • Chicago is 2 hours ahead of Los Angeles
  • Chicago is 6 hours behind Paris
  • Chicago is 10.5 hours behind Mumbai

Examples: