Date & Time calculators
Age, date differences, business days, time zones and calendar questions answered precisely.
Age Calculator
Exact age in years, months and days from a birth date.
Date Duration Calculator
The length of a period as years, months and days, plus total days.
Days Between Dates Calculator
Total days, weeks and business days between two dates.
Add Days to Date Calculator
The date a number of calendar or business days from a start date.
Business Days Calculator
Working days and weekend days between two dates.
Work Hours Calculator
Daily and weekly hours worked and pay, breaks included.
Time Duration Calculator
Elapsed time between two date-times in hours, minutes and days.
Time Zone Converter
Convert a date and time between world time zones, DST aware.
Week Number Calculator
ISO 8601 week number, week year and day of year for any date.
Day of Week Calculator
Which weekday any date falls on — past or future.
Leap Year Calculator
Is a year a leap year? Days in the year, February length and the next leap year.
Unix Timestamp Converter
Convert Unix timestamps (seconds) to dates and back, in UTC.
Time Add / Subtract Calculator
Add or subtract hours, minutes and seconds from a time of day.
Days Until Calculator
Countdown in days and weeks from one date to another.
Zodiac Sign Calculator
Your Western zodiac sign from your birth month and day.
Chinese Zodiac Calculator
Chinese zodiac animal, element and yin/yang for a birth year.
Retirement Date Calculator
The calendar date you reach retirement age, and the time left until then.
Quarter Calculator
Calendar and fiscal quarter of a date, plus its day within the quarter.