Business Days Calculator
Custom work weeks and holiday lists.
- Free
- No signup
- No login
Inputs
Result
How this tool works
Choose the source and destination zones, then enter a date and time. The tool finds the exact UTC instant for your local time and shows it in both zones.
Use the "time I entered is in" option to convert from the destination side instead. If the clocks skip or repeat the time you typed, the tool tells you instead of guessing.
Time-zone rules come from the IANA database in your browser. This server uses database version 2026.5. If governments changed a rule very recently, the two can briefly disagree, so confirm important meetings with participants.
Frequently asked questions
What happens during a daylight saving change?
If a local time does not exist because clocks move forward, you are asked to choose another time. If it happens twice because clocks move back, you choose which occurrence you mean.
Why does the same conversion give a different gap in other months?
Many zones change their offset during the year, so the difference depends on the date. The tool always uses the offset in force on the date you enter.