My Time Zone Calculator

Your Zone	Target Zone	Input Time	Converted Time	Offset Difference	Overlap Hours
Asia/Karachi	Europe/London	2026-04-15 03:00 PM	2026-04-15 11:00 AM	-4.00 hours	4.00 hours
America/New_York	Asia/Tokyo	2026-04-15 09:00 AM	2026-04-15 10:00 PM	+13.00 hours	0.00 hours
Australia/Sydney	Asia/Dubai	2026-04-15 02:30 PM	2026-04-15 08:30 AM	-6.00 hours	2.00 hours

Formula Used

1) Time conversion: Target Time = Input Time + (Target UTC Offset − Base UTC Offset).

2) Offset difference: Difference in Hours = (Target Offset Seconds − Base Offset Seconds) ÷ 3600.

3) Work overlap: Overlap = max(0, min(Base End, Target End in Base Zone) − max(Base Start, Target Start in Base Zone)).

4) Day shift: Compare the converted calendar date with the original date to label same day, next day, or previous day.

5) DST check: The calculator reads daylight saving status from each time zone at the selected moment.

How to Use This Calculator

Select your current time zone.
Select the destination or comparison time zone.
Choose the date and exact local time.
Enter meeting duration in hours.
Enter working hours for both locations.
Click the calculate button.
Review converted time, UTC offsets, overlap hours, and day shift.
Use the chart for visual comparison.
Download the result as CSV or PDF when needed.

FAQs

1. What does this time zone calculator do?

It converts your selected date and time into another zone. It also compares UTC offsets, checks daylight saving status, shows date shifts, and estimates workday overlap.

2. Why can converted time land on another day?

Large offset differences can push the result into the previous or next calendar day. The calculator clearly labels that day shift for easier planning.

3. Does the calculator account for daylight saving time?

Yes. It uses the selected date and the built-in time zone database. That lets it detect whether daylight saving time is active for each region.

4. What are overlap hours?

Overlap hours are the shared working hours between both zones after converting the target workday into your selected base zone. They help schedule meetings faster.

5. How is the suggested meeting start chosen?

The calculator picks the earliest time inside the shared overlap window. If no overlap exists, it reports that no recommended shared start is available.

6. Can I use half-hour or quarter-hour meeting durations?

Yes. The duration field supports decimals such as 0.25, 0.5, 1.25, or 1.75 hours, which helps with realistic scheduling needs.

7. Why are UTC offsets shown separately?

Separate offsets make the comparison easier to verify. They also explain why some cities have unusual differences during daylight saving periods.

8. What can I export from this calculator?

You can export the calculated result table as a CSV file for spreadsheets or as a PDF file for reports, planning notes, and sharing.