Calculators & Converters
Date Calculator
Measure the interval between two dates, add or subtract days, months or years, count weekdays, or calculate how many days remain until or have passed since a target date.
Calculate calendar dates
Date Calculator
Measure date intervals, add or subtract calendar time, and count business days.
Date operation
Result
- Weeks + Days
- —
- Calendar Difference
- —
- Weekdays
- —
- Weekend Days
- —
- Day of Week
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Weekday calculation excludes weekends only and does not account for public holidays.
Your dates are processed locally in your browser and are not transmitted or stored by this tool.
Dates and results stay in browser memory. The tool does not connect to a government, holiday or appointment system.
How to use the date calculator
- 1
Choose difference, add/subtract, weekday count or until/since mode.
- 2
Enter the required start, end or target date.
- 3
Select inclusive counting only when the end date should be counted.
- 4
Run the calculation and review calendar days or weekdays.
- 5
Check public holidays separately when planning official business deadlines.
Days between two dates
Date-only values are normalized through UTC day serials to avoid daylight-saving transitions adding or removing an hour. The standard difference excludes the starting date. Inclusive mode counts the ending date as well, which increases a positive interval by one day.
Date-difference example
From September 1 to September 11 is 10 calendar days when the start date is excluded. If the end date is included, the count becomes 11 days.
Adding months and years
Calendar months have different lengths. When month or year arithmetic lands beyond the last valid day, the tool clamps to that month’s final date. For example, adding one month to January 31 cannot create February 31.
Weekdays and business days
Weekday mode skips Saturday and Sunday and excludes the starting date. It does not include a public-holiday calendar, religious calendar or organization-specific working week. A UAE, Pakistan or other local business-day result may need separate holiday and weekend adjustments.
Important limitations
- Date range: supported dates run from 1900 through 2100.
- No time of day: the tool works with calendar dates, not hours, minutes or time zones.
- No Islamic conversion: it does not convert Gregorian dates to Hijri dates.
- Legal deadlines: confirm court, tax, visa and contract dates with the responsible authority.
Related tools
Date Calculator FAQ
How many days are between two dates?
Enter the start and end dates. The standard result excludes the starting date unless an inclusive option is selected.
Can I add or subtract months?
Yes. The tool uses calendar-aware month arithmetic and clamps to the last valid day when needed.
Does weekday counting include holidays?
No. It skips Saturday and Sunday but does not load public-holiday calendars.
Can I calculate days until a future date?
Yes. Use the until/since mode and enter the target date.
Does it support Hijri dates?
No. The calculator uses Gregorian calendar dates from 1900 through 2100.
Are my dates stored?
No. Date calculations stay in browser memory.
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