Best overlap: 8:30 AM to 9:30 AM in Kolkata is 5:00 PM to 6:00 PM in Honolulu.
Shoot for 8:30 AM to 9:30 AM in Kolkata; your Honolulu colleagues will see that as 5:00 PM to 6:00 PM. The overlap barely stretches to 1 hour, so reserve it for what really needs a live conversation and handle the rest async. The date rolls over between them: Honolulu is on the previous day relative to Kolkata during these hours.
| Local time | 12am | 1am | 2am | 3am | 4am | 5am | 6am | 7am | 8am | 9am | 10am | 11am | 12pm | 1pm | 2pm | 3pm | 4pm | 5pm | 6pm | 7pm | 8pm | 9pm | 10pm | 11pm |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Kolkata Asia/Kolkata | ||||||||||||||||||||||||
Honolulu Pacific/Honolulu |
A complete guide to time zones in 2025, from UTC and GMT differences to Daylight Saving Time changes, IANA database rules, abbreviation pitfalls, and developer best practices for handling global time. -