Time Zone Converter
Convert a date and local time across IANA time zones, handle DST gaps and overlaps explicitly, and find weekday working-hours overlap for international meetings.
Meeting time
Enter the wall-clock time in the source time zone, then add every location you need to compare.
Target time zones
Working hours
Overlap uses each location's local Monday–Friday schedule. Holidays and personal calendars are not included.
Monday–Friday in each location
Converted time
Every row represents the same instant using the selected date's actual time-zone rules.
Choose a date to convert
Your reusable time zones and working hours are ready. Select a date to calculate the result.
Quick Start
Common Scenarios
Every converted row is the same instant; a next-day or previous-day label only describes its calendar date relative to the source.
Working-hours overlap checks Monday–Friday and the same start/end hours in each location. It does not know public holidays, leave, or personal availability.
The visual timeline samples the day for readability, while overlap windows are calculated separately to one-minute precision.
DST & Time-Zone Boundaries
Limitations & Compatibility
Privacy & Security
FAQ
Some regions move clocks forward or back for daylight saving time. Moving forward creates a gap; moving back creates an overlap with two offsets and two real instants.
It excludes each location's Saturday and Sunday and checks only the hours you set. It does not include public holidays, leave, or personal calendar availability.