About this collection
Date differences, business days, durations, week numbers and time calculations. 11 free tools.
Date & Time
Date differences, business days, durations, week numbers and time calculations.
Business Days Calculator
Count weekdays between two dates and optionally exclude custom holidays.
Days Between Dates
Calculate calendar days, weeks and approximate months between two dates.
Add / Subtract Date
Add or subtract calendar days or business days from a date.
Age Calculator
Calculate exact age, total days lived and time until the next birthday.
Unix Timestamp Converter
Convert Unix timestamps to local/UTC dates and back in seconds or milliseconds.
Week Number
Show ISO week number, day of year and quarter for a selected date.
Time Duration
Calculate duration between two times in hours and minutes.
Hours & Minutes Calculator
Add or subtract hour:minute durations.
Countdown Calculator
Calculate days, hours and minutes remaining until a future date.
Day of Week Calculator
Find the day of the week for any date.
Time Zone Converter
Convert a date/time between browser-supported IANA time zones.