Best overlap: 5:30 PM to 6:30 PM in Kolkata is 8:00 AM to 9:00 AM in Montreal.
Plan around 5:30 PM to 6:30 PM in Kolkata, which is 8:00 AM to 9:00 AM in Montreal, to catch everyone during office hours. Overlap is at a premium — roughly 1 hour — so claim 5:30 PM in Kolkata (8:00 AM in Montreal) for recurring calls and keep them on time. For part of the year the maths changes: Montreal observes daylight saving, Kolkata does not, shifting the overlap by an hour.
| 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 | ||||||||||||||||||||||||
Montreal America/Toronto |
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. -