📅 Date & Time calculators
Free date and time calculators: age, days between dates, add days to a date, business days, hours worked, time zones and timestamps.
12 free tools · no sign-up · formulas explained
Age CalculatorCalculate your exact age in years, months, weeks and days, the day of the week you were born, and the countdown to your next birthday.Date Difference CalculatorFind exactly how many days, weeks, months and years separate two dates, including the number of weekdays in between.Hours CalculatorFill in a weekly time card with start, end and break times to total the hours worked and, optionally, the pay due.Time Zone ConverterConvert a date and time between any two time zones, with daylight saving time handled automatically, plus a world clock.Business Days CalculatorCount the working days between two dates, or add a number of business days to a date to find a deadline, skipping weekends.Countdown CalculatorCount the days, weeks and months until Christmas, New Year or any custom event – or the days since a date that has passed.Date CalculatorAdd or subtract any number of years, months, weeks and days from a date to find the exact calendar date it lands on.Day of the Week CalculatorFind the day of the week for any date, from birthdays and historic events to future plans, with the maths shown step by step.Time Duration CalculatorWork out how long it is from one clock time to another, including overnight spans, in hours and minutes or decimal hours.Time to Decimal ConverterConvert hours and minutes to decimal hours for timesheets and invoices, or convert decimal hours back to hours, minutes and seconds.Unix Timestamp ConverterConvert Unix epoch timestamps (seconds or milliseconds) to human-readable UTC dates, and dates back to timestamps.Week Number CalculatorFind the ISO week number for any date, with the dates the week starts and ends, the day of the year and the days remaining.