Best overlap: 9:00 AM to 6:00 PM in Kolkata is 8:30 AM to 5:30 PM in Islamabad.
Plan around 9:00 AM to 6:00 PM in Kolkata, which is 8:30 AM to 5:30 PM in Islamabad, to catch everyone during office hours. Islamabad is 0.5 hours behind Kolkata, but you'd hardly notice — 9 hours of shared hours makes this feel like working in neighbouring time zones.
| 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 | ||||||||||||||||||||||||
Islamabad Asia/Karachi |
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. -