Time & Date
Age, date difference, business days, deadlines and time zones — a small hub kept separate because the search intent is distinct.
Age in years, months and days; the difference between two dates; adding or subtracting days, weeks or months; business days excluding weekends and holidays; week numbers, countdowns and duration sums.
Time zone conversion and meeting-time planning across regions are here too, along with work-hour and timesheet totals.
This hub stays separate from Unit Conversions deliberately: date arithmetic is a distinct, high-volume search intent and merging it would bury it inside a much larger set.
14 calculators in 1 section.
Matches are ranked by relevance. Use CtrlK anytime to search the full site.
Age, Dates & Time Zones
Age, date difference, business days, countdowns and time zone conversion.
Age Calculator
Calculate your exact age in years, months, days, and more. Find out how many days until your next birthday.
Date Difference Calculator
Calculate the exact number of days, months, and years between two dates. Also shows weeks, hours, and minutes.
Work Hours Calculator
Calculate daily, weekly, monthly, and annual work hours. Estimate pay based on your hourly rate, including overtime.
Business Days Calculator
Calculate the date that is a given number of business days from a start date. Excludes weekends automatically.
Unix Timestamp Converter
Convert between Unix timestamps and human-readable dates. Get the current Unix time or convert any date to a timestamp.
Countdown Calculator
Count down to any date. See remaining days, hours, minutes, weeks, work days, and sleeps until your target date.
Timezone Converter
Convert times between world cities with an interactive timezone map. See colored timezone bands, city markers, and time differences at a glance.
Leap Year Calculator
Check if a year is a leap year, find the next and previous leap years, and see how many leap years are in the century.
Age in Days Calculator
Calculate your exact age in days, weeks, months, years, hours, minutes, and seconds. Perfect for milestones and celebrations.
Date & Time Master Calculator
Calculate age, date differences, countdowns, Unix timestamps, and track milestones all in one place.
Time Card Calculator
Weekly hours, overtime and pay from clock times.
Future Date
Add N calendar days to a start date (Gregorian, proleptic).
Day of Week
Day of week for any Gregorian date (Sakamoto method).
DST Reference
Educational note on one-hour clock shifts (not a timezone database).