Date Calculator
Add or subtract time from any date, then compare two dates by total days, weeks, weekdays, and exact calendar distance.
| Total Weeks | 4 |
| Weekdays Between | 21 |
| Direction | Forward order |
| Start Weekday | Saturday |
| End Weekday | Monday |
Why date math is easy to get wrong
Adding 30 days is not the same thing as adding one calendar month. February, leap years, and month-end boundaries make naive arithmetic fail quickly. This calculator keeps those two ideas separate so you can choose the correct interpretation for contracts, deadlines, subscriptions, invoicing, or planning.
It also helps when you need more than one representation of a date difference. In project work, you might care about total days. In HR or legal paperwork, you may need completed years, months, and days. In operations, you may care about weekdays between two dates. This page gives all three views in one place.
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