🗓️ Date & Age Calculators
Free date calculators: exact age, date differences, add or subtract days and weeks, business days, week numbers, day of year, epoch and Julian dates.
Calendar math without counting on fingers: exact age in years, months and days; differences between any two dates; add or subtract days, weeks, months from a start date.
Business-day tools skip weekends with configurable holidays, week numbers follow ISO 8601, and converters bridge epoch timestamps and Julian dates for developers.
Age Calculator
Calculate your exact age in years, months and days.
Business Day Calculator
Add or subtract business days from any date, automatically skipping weekends.
Calendar Generator
Generate clean monthly calendars for any month and year, ready to view or print.
Date Calculator
Find the number of days between two dates, or add/subtract days from any date. Simple, fast, and accurate.
Date Difference Calculator
Calculate days between two dates.
Day of Year Calculator
Find the day of the year (1-366) for any date, plus days remaining in the year.
Epoch Converter
Convert between Unix timestamps and human-readable dates instantly.
Germany Notice Period Calculator
Work out the statutory Kündigungsfrist for any German job - pick who gives notice, enter the hire date and notice date, and see the required weeks or months and the earliest legal end date.
TÜV / HU Due Date Calculator
Enter the Erstzulassung (first registration) date of your German-registered car to find the next HU / TÜV due date, the days remaining, and the recommended window for booking the inspection.
Julian Date Converter
Convert between Julian Day Number and Gregorian calendar dates for astronomy and science.
Spain Codigo Postal Lookup
Look up Spanish postal codes (codigo postal) by province. Find any 5-digit CP for mail delivery, address verification, and autonomo registration.
Spain Festivos Checker
Look up Spanish public holidays (dias festivos) for 2026: national, regional, and local. Check if a date is a holiday in any autonomous community.
UK Bank Holidays Checker
View all UK bank holidays for 2026 and 2027 by nation. Check if a specific date is a bank holiday and find the next upcoming public holiday.
Week Number Calculator
Find the ISO week number for any date and see week start and end dates instantly.
Frequently asked questions
How is age counted across month boundaries?
Years, months and days are computed by calendar borrowing — Feb 28 to Mar 30 gives one month and two days, not an approximation.
Are holidays included in business days?
Weekends are skipped by default; holidays are configurable so you can add your national list per calculation.
Which week numbering is used?
ISO 8601 — weeks start Monday and week 1 contains the first Thursday of the year, matching most of Europe and international standards.