Add or subtract date/time
Add or subtract date/time lets you add calendar and clock units with explicit time zone and month-end constrain policy in your browser.
Business day calculator
Business day calculator lets you count inclusive business days excluding chosen weekdays and entered holidays in your browser.
Business day calculator
⌂ Inputs and results stay in this browser and are not automatically stored or sent.
Waiting for input
Input
Checked weekdays and entered holidays are excluded. National holidays are not loaded automatically.
Output
Waiting for input
Complete text result
How to use
Set start/end dates, non-working weekdays, explicit holidays, and whether each endpoint is included.
Holidays are not inferred from your language or country. Check organization-specific closures and duplicate dates, and report the count together with its period and inclusion rules.
Examples
2026-10-01
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2026-10-31Principles and limits
Each input is limited to 1,048,576 bytes, output to 33,554,432 bytes, and processing to 5,000 ms. Input is never silently truncated.
Guides
Related tools
Date and time difference
Date and time difference lets you calculate elapsed milliseconds, seconds, and duration between instants in your browser.