Calculate date gaps and date offsets
Find the number of days between two dates, or add and subtract days, weeks, months and years with month-end handling.
All tools
Plan dates without manual counting
Date Calculator
Find the exact day difference between dates, or move a date by days, weeks, months or years.
Runs locally in your browserDifference between dates
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Add or subtract time
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Use either calculator
For a difference, choose start and end dates. For an offset, choose a base date, amount, unit and operation, then calculate the resulting date.
Method and sources
Calculations use the browser Date and Intl APIs. Calendar-only calculations use UTC-normalized dates to avoid daylight-saving time changing the result.
Frequently asked questions
What can Date Calculator do?
Find the number of days between two dates, or add and subtract days, weeks, months and years with month-end handling.
How do I use Date Calculator?
For a difference, choose start and end dates. For an offset, choose a base date, amount, unit and operation, then calculate the resulting date.
Does Date Calculator upload my data?
The tool runs in your browser. Your selected files, entered content and generated results are not sent to Zituo Tools.