Time calculators
Date and scheduling tools — work out durations, deadlines and working hours.
Days & weeks between dates
Elapsed days between two dates, also shown in weeks and weeks-plus-days.
Business days between dates
How many working days are between two dates.
Add/subtract days
Add or subtract days from a date.
Months between dates
How many complete months are between two dates.
Hours between times
Hours between two times of day, including overnight.
Shift-length calculator
Paid length of a work shift minus a break.
Working-hours calculator
Weekly and annual working hours.
Break-time calculator
Total break time per week and per year.
Countdown calculator
Days remaining until a target date.
Meeting overlap helper
Find a shared time window between two people.
Counting dates and hours correctly
The most common date mistake is an off-by-one: whether the start day, end day, or both are counted. The days between dates tool gives the difference between the two dates (so Monday to Tuesday is one day); add one if your rule counts both the first and last day.
Calendar days vs business days
Deadlines expressed in working days skip weekends and usually public holidays. Use business days between dates for those; public holidays differ between countries and regions, so check whether they need excluding for your situation.
Months are uneven
Months range from 28 to 31 days, so "one month later" is not a fixed number of days. Months between dates counts complete calendar months only.
Hours and shifts
Shifts that run past midnight and unpaid breaks are the usual sources of error in timesheets. The shift-length calculator handles overnight shifts and subtracts breaks explicitly; the working-hours calculator totals hours across a period.