Date & Time Calculators
Count the days, hours, and time between dates — for deadlines, ages, work hours, and everything in between.
Which calculator do I need?
For everyday date math, Days Between Dates counts the gap between any two dates, Add / Subtract Days rolls a date forward or backward, and the Age Calculator and Age Difference tools turn birthdays into exact years, months, and days.
At work, the Business Days Calculator skips weekends when deadlines only count working days, the Deadline Calculator projects a due date from a start date and turnaround time, the Time Card Calculator adds up a week of punches, and Hours Between Times handles a single shift, including ones that cross midnight.
The rest are small daily helpers: Countdown / Days Until for the dates you are looking forward to, Day of the Week for any date in history, Week Number for planners who think in ISO weeks, the Military Time Converter for 24-hour time, and the Sleep Calculator to time bedtime around full sleep cycles.