Date tools
Age, dates, weekdays, and business-day answers.
Calculate age, date differences, weekdays, ISO weeks, business days, and Unix timestamps.
Timestamp Converter
Convert Unix timestamps in seconds or milliseconds into local time, UTC, and ISO strings.
Open toolAge Calculator
Calculate exact age in years, months, and days with total days lived and next birthday countdown.
Open toolDate Calculator
Add or subtract calendar months, days, weeks, and years from any date and see the exact result, weekday, and ISO date.
Open toolDays Between Dates
Find the exact days, weeks, months, and years between two calendar dates.
Open toolBusiness Days Calculator
Count Monday to Friday business days between two dates and separate weekend days.
Open toolDay of Week Calculator
Find what day of the week any date falls on, plus day-of-year and ISO week details.
Open toolWeek Number Calculator
Calculate the ISO week number, ISO week-year, weekday number, and weeks in the year.
Open toolLeap Year Calculator
Check whether a year is a leap year and see days in the year, February length, and nearby leap years.
Open toolLearn the workflow