Date & Time Calculators
Free online date & time calculators and tools, including Age Calculator, Birthday Countdown Calculator, Business Days Calculator. Fast, simple and easy to use.
15 toolsAge Calculator
Calculate exact age in years, months and days, plus total days and the next birthday.
Birthday Countdown Calculator
See the days until your next birthday, current age, and weekday.
Business Days Calculator
Count weekdays between two dates with explicit inclusive or elapsed rules.
Countdown Calculator
Count days and whole weeks between a start date and target date.
Date Add/Subtract Calculator
Add or subtract years, months, weeks and days with safe month-end handling.
Day of Year Calculator
Find a date's ordinal day and how many days remain in the year.
Days Between Dates
Count elapsed or inclusive days between two dates with weeks and calendar differences.
Hours Calculator
Calculate worked hours from clock-in, clock-out, and unpaid breaks.
Leap Year Checker
Check Gregorian leap-year status, year length, and the next leap year.
Recurring Date Calculator
Generate daily, weekly, monthly, or yearly dates with safe calendar rules.
Time Card / Timesheet Calculator
Total multiple shifts, breaks, overtime, and optional estimated gross pay.
Time Duration Calculator
Calculate elapsed hours and minutes for same-day or overnight times.
Time Zone Converter
Convert wall-clock times between IANA zones with explicit daylight-saving handling.
Unix Timestamp Converter
Convert Unix seconds or milliseconds to labelled UTC and local date-times.
Week Number Calculator
Find the ISO week number, week-year, and weekday for any date.