Free Date & Time Calculators
4 toolsCalculate durations, add or subtract dates, work out hours between times, and find week numbers - free date and time tools.
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Date Duration Calculator
Calculate the number of days, months, and years between any two dates. Includes business days and week count.
Date Add / Subtract
Add or subtract days, weeks, months, or years from any date. Perfect for planning deadlines and project schedules.
Time Duration Calculator
Calculate hours, minutes, and seconds between two times. Supports overnight shifts and break deductions.
Week Number Calculator
Find the ISO week number for any date or calculate which dates fall in a given week number.
About Date & Time Tools
Count the gap between two dates with the Date Duration Calculator, project a deadline with Date Add / Subtract, total hours (including overnight shifts) with the Time Duration Calculator, or find any date's ISO week number.
Each tool handles leap years and month lengths correctly, so the results are exact rather than approximate.
Frequently Asked Questions
Do the date tools handle leap years?
Yes. They use real calendar dates, so leap years and different month lengths are accounted for.
Can I count only business days?
Yes. The Date Duration Calculator offers a working-day count that excludes weekends.
Can it handle overnight time spans?
Yes. The Time Duration Calculator correctly handles times that cross midnight.