What this tool does
- Adds or subtracts business days and calendar intervals.
- Converts meeting times between IANA timezones.
- Calculates ISO week, quarter, and duration values.
Date & time calculator
Business-day rules, IANA timezone conversion, ISO week/quarter boundaries, and duration parser/formatter.
Work week days
History states
Ready.
| Zone | Local time | Date | Day |
|---|
Ready.
How to use it
- Choose the calculation mode.
- Enter the starting date, time, zone, or duration.
- Review the result and copy or export it if needed.
Common use cases
- Calculate a support deadline after a fixed number of business days.
- Find the duration between two events before writing an invoice.
- Build a delivery, support, or billing timeline.
Notes
- Timezone-sensitive results show the selected source and target timezone.
- Business-day calculations depend on the selected country and custom holiday rules.
- Use one inclusive or exclusive end-date rule consistently inside the same workflow.
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