Skip to main content
MyCalculator.toMyCalculator.to

Date & Time

Browse all 15 date & time tools

What is date and time calculators?

Date and time calculators compute durations, convert timestamps, and calculate astronomical events — from finding the exact number of days between two dates and your precise age to determining sunrise times, moon phases, and jet lag recovery for any location.

Age Calculator

Calculate your exact age in years, months, and days. See days until your next birthday.

age calculatorhow old am ibirthday calculator
Open tool

Birthday Countdown

Live countdown to your next birthday with zodiac sign and day-of-week info.

birthday countdowndays until birthdaynext birthday
Open tool

Countdown to Date

Live countdown to any future date with days, hours, minutes, and seconds display.

countdown to datedate countdowndays until
Open tool

Date Difference Calculator

Find the exact difference between two dates in years, months, days, weeks, and business days.

date differencedays between datesdate calculator
Open tool

Day of Year Calculator

Find the ordinal day number for any date with days remaining and year progress.

day of yearordinal datejulian day
Open tool

Jet Lag Calculator

Calculate jet lag recovery time and get direction-specific tips for any international flight.

jet lag calculatorjet lag recoverytime zone travel
Open tool

Leap Year Checker

Check if any year is a leap year and find next/previous leap years instantly.

leap year checkeris it a leap yearleap year calculator
Open tool

Moon Phase Calculator

Find the moon phase for any date. See illumination, moon age, and all 8 phase names.

moon phase calculatormoon phase todaylunar calendar
Open tool

Sunrise/Sunset Calculator

Find sunrise, sunset, solar noon, and day length for any city or coordinates.

sunrise calculatorsunset timesolar noon
Open tool

Time Duration Calculator

Add or subtract time values and convert between hours, minutes, seconds, and decimal hours.

time duration calculatoradd timesubtract time
Open tool

Time Zone Converter

Convert time between 60+ world time zones. Compare cities, handle DST, and copy results.

time zone converterworld clockconvert time zones
Open tool

Timezone Abbreviation Lookup

Look up timezone abbreviations with UTC offsets, full names, and regions.

timezone abbreviationtime zone lookuputc offset
Open tool

Week Number Calculator

Find the ISO week number for any date with a full year calendar view.

week numberiso weekweek of year
Open tool

Work Days Calculator

Count business days between dates, excluding weekends and US federal holidays.

work days calculatorbusiness daysweekdays between dates
Open tool

World Clock

Display current time in multiple world cities simultaneously with DST handling.

world clockcurrent timetime zones
Open tool

Formula & Methodology

💡

Did you know? Unix time (epoch time) counts the number of seconds since January 1, 1970, at 00:00:00 UTC — a date known as the Unix Epoch. On January 19, 2038, at 03:14:07 UTC, 32-bit systems will experience the "Year 2038 problem" (Y2K38) as the counter overflows its signed integer limit.

Sources

  • International Earth Rotation and Reference Systems Service (IERS) — UTC and leap second standards
  • U.S. Naval Observatory (USNO) — Astronomical calculations for sunrise, sunset, and moon phases

Frequently Asked Questions