Time Calculator
In-browser calculators for everyday date and time math: business days with public holidays, adding or subtracting time, the gap between two dates, hours worked, age and Unix timestamps. Results update as you type, and every calculator runs locally in your browser.
Business days calculator
Working days between two dates, or a date a number of working days away — skipping weekends and, optionally, a country's public holidays.
Add or subtract working days
Holidays are national public holidays (including substitute days) from the open-source date-holidays dataset; regional and state holidays are not included.
Add or subtract time
Start from a date and time and move forward or back by any mix of units. Months respect month lengths: 31 January + 1 month = the last day of February.
Date-time difference
Returns the gap between two date-time values in days, hours, and minutes.
Days between two dates
Whole-day count between two calendar dates, plus weeks and months breakdown.
Hours worked
Shift length from start and end times minus unpaid breaks. End times earlier than the start are treated as overnight shifts.
Age calculator
Years, months, and days from a birthdate to a target date.
Hours and minutes
Add several HH:MM values together — useful for tracking work hours or training time.
Unix timestamp converter
Convert between Unix seconds and a human-readable date.
Related tools
More date and time utilities: converters, counters, and reference pages.