Date Lab
General calendar arithmetic for durations, date shifts, weekdays and working days.
Days Between Dates Calculator
Elapsed calendar days between two dates.
Date Difference Calculator
Calendar difference in years months days and total days.
Time Between Dates Calculator
Calendar duration between two selected dates.
Add Days to Date Calculator
A future or past date after adding calendar days.
Subtract Days From Date Calculator
A date found by subtracting calendar days.
Add Weeks to Date Calculator
A date after adding complete seven-day weeks.
Subtract Weeks From Date Calculator
A date found by subtracting complete weeks.
Add Months to Date Calculator
A calendar date shifted forward by complete months.
Subtract Months From Date Calculator
A calendar date shifted backward by complete months.
Add Years to Date Calculator
A calendar date shifted forward by complete years.
Subtract Years From Date Calculator
A calendar date shifted backward by complete years.
Business Days Calculator
Weekdays between two dates with weekends excluded.
Workdays Between Dates Calculator
Monday-to-friday workdays across a date interval.
Week Number Calculator
Iso week number for a selected calendar date.
Day of Year Calculator
Ordinal day number within the selected year.
Days Left in Year Calculator
Remaining calendar days before the end of the year.
Leap Year Calculator
Whether a selected year follows the gregorian leap-year rule.
Weekday Calculator
Day of the week for any valid calendar date.
Months Between Dates Calculator
Complete calendar months and residual days between dates.
Years Between Dates Calculator
Complete calendar years plus remaining months and days.