Date & Time
Calculate ages, date differences, durations, and time zones in seconds. 30 free tools, fast and accurate.
💡 Whether you're counting down to an event, working out your exact age, or converting time zones, these date and time tools give you precise answers instantly.
Date & Time
Add Hours to Time Calculator
Add or subtract hours and minutes from a time
Age Calculator
Exact age in years, months, days
Age Difference Calculator
Exact gap between two birth dates
Business Days Calculator
Count business days (Mon-Fri) between two dates
Countdown Timer Calculator
Days, hours and weekday until your target date
Date Add/Subtract Calculator
Add or subtract days, find the new weekday
Date Calculator
Add or subtract days to a date
Date Difference Calculator
Days between two dates
Date Range Overlap Calculator
Check whether two date ranges overlap
Day of Week Calculator
Find the weekday, day-of-year and ISO week for any date
Days Until Calculator
Countdown to a date
Days in Month
Number of days in a given month
Hours Calculator
Work hours and minutes total
Korean Age Calculator
International, Korean, and year age compared
Leap Year Calculator
Is a year a leap year
Moon Phase Calculator
Phase, illumination, and days to next full moon
Percent of Year Calculator
How much of the year has elapsed
Sleep Cycle Calculator
Best bedtimes so you wake refreshed
Time Billing Calculator
Convert tracked time into billable amounts with tax
Time Card Calculator
Compute hours worked from clock-in / clock-out
Time Difference Calculator
Hours and minutes between two clock times
Time Duration Calculator
Duration between times
Time From Now Calculator
Add or subtract any number of days from a date
Time Zone Converter
Convert time across zones
Time Zone Meeting Calculator
Find the best meeting time across time zones
Unix Timestamp Converter
Convert between Unix time and human-readable dates
Week Number Calculator
ISO week number of a date
Weekday Counter
Count weekdays vs weekends between two dates
What Day Was I Born?
Weekday, age in days, and birthstone
Workday Clock Calculator
Calculate net work hours from clock-in / clock-out