Time Zone Converter
Convert time between time zones by applying hour offsets. See the converted time, day change status, and UTC equivalent.
* All calculations are approximate.
How Time Zone Converter Works?
Convert time between time zones by applying hour offsets. See the converted time, day change status, and UTC equivalent.
Enter the source time in 24-hour format — specify the hour (0-23) and minute (0-59) in IST.
Input the time offset in hours between the source and target time zone (e.g., -10 for IST to US EST).
The converter adds the offset to your source time to calculate the converted time.
If the result goes below 0 or above 23, the converter handles the day change and shows whether the converted time falls on the previous or next day.
The UTC equivalent is also displayed for universal reference — all time zones are offsets from UTC.
Formula Used
Converted Time = Source Time + Offset Hours; If result < 0, add 24 and mark 'Previous Day'; If result >= 24, subtract 24 and mark 'Next Day'
This converter uses whole-hour offsets. Some time zones have 30 or 45-minute offsets (e.g., India UTC+5:30, Nepal UTC+5:45). Also remember that Daylight Saving Time shifts clocks by 1 hour in many countries.
Important — Read Before You Decide
- India follows a single time zone (IST, UTC+5:30) despite spanning a wide geography
- The US has 4 major time zones — Eastern, Central, Mountain, and Pacific
- Daylight Saving Time (DST) shifts clocks by 1 hour in many countries, but not in India
- Some time zones have 30 or 45-minute offsets (e.g., India +5:30, Nepal +5:45)
- International Date Line (IDL) can mean the same moment is two different calendar dates
- Scheduling international meetings requires checking DST status of all participants
- UTC (Coordinated Universal Time) is the global standard — all time zones are offsets from it
- China uses a single time zone (UTC+8) despite spanning 5 geographical zones
What Happens If You Ignore These?
- Miscalculating time zones causes missed meetings and flight connections
- Forgetting DST changes leads to being 1 hour early or late for calls
- Not accounting for day changes can cause confusion with deadlines
- Setting alarms in the wrong time zone means missed events while travelling
Smart Tips
- US EST is IST minus 10:30 hours; US PST is IST minus 13:30 hours
- UK GMT is IST minus 5:30 hours (but BST in summer is IST minus 4:30)
- Use world clock on your phone to add cities you frequently coordinate with
- When scheduling across zones, send calendar invites — they auto-adjust for recipients
- Remember: moving east adds hours, moving west subtracts hours from UTC
Frequently Asked Questions
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