Date Calculator
Add days, weeks, months or years to a date or subtract them from it. You get the resulting date with its day of the week and the calculation at a glance.
Add or subtract days, weeks, months, or years to a date.
Note: These calculations are for informational purposes only and do not replace professional tax or financial advice. All information without guarantee.
FAQ
Frequently Asked Questions
How do I add months to a date?
When adding months, the same day number is used in the target month. If the target month has fewer days (e.g. 31 January + 1 month), it rounds to the last day of February.
When do claims expire (limitation)?
The standard limitation period is 3 years (§ 195 BGB). It begins at the end of the year in which the claim arose. A claim from May 2023 expires on 31 December 2026.
What is an exclusion deadline?
Exclusion deadlines permanently extinguish the right if missed, without any possibility of reinstatement. Examples: unfair dismissal claim (3 weeks), inheritance renunciation (6 weeks), objection period (1 month).
What day of the week is a particular date?
Our date calculator shows the weekday for every computed date. For reference: 1 January 2026 is a Thursday.
Guide
What is the Date Calculator?
The date calculator adds and subtracts days, weeks, months and years from a date and computes date differences in various units.
How does the Date Calculator work?
Choose a base date and specify how many days, weeks, months or years to add or subtract. The calculator shows the resulting date and weekday. For difference calculations: enter two dates.
Key Data and Facts
Date arithmetic: months have different lengths (28–31 days). Leap years: February has 29 days. ISO 8601: date format YYYY-MM-DD. Legal deadlines: § 187 BGB governs start and end of periods.
Step-by-Step Guide
Step-by-step: 1. Choose base date. 2. Choose operation (+ or −). 3. Enter unit and value (days, weeks, months, years). 4. Read result: new date + weekday. 5. Legal deadlines: 2-week withdrawal, 3-year limitation (year end!), notice periods. 6. Adding months: 31 January + 1 month = last day of February.
Calculation Example
Notice given 10 October, 3-month period: last working day 10 January. Limitation: arose 5 May 2023, expires 31 December 2026. Holiday: departs 20 July + 14 days = returns 3 August.
Sources
Official sources
Calculations are based on applicable German laws and official data:
Full methodology at Methodology.
Reviewed by Konstantin Iakovlev · Last updated:
Date & Time
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