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

/tz
↵  
  • Chicago, US: 10:56 pm CDT, Sun Jul 25th
  • Chicago is 1 hour behind you
  • Los Angeles, US: 8:56 pm PDT, Sun Jul 25th
  • Los Angeles is 3 hours behind you
  • Paris, FR: 5:56 am CEST, Mon Jul 26th
  • Paris is 6 hours ahead of you
  • Mumbai, IN: 9:26 am IST, Mon Jul 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: