Tool categoryRecently expanded
Date & Time Tools
Date-math calculators — business days, time zones, countdowns, ages, and calendar generation — for scheduling and planning.
Tools
Date & Time Tools
Featured guides in this category — tools with a deeper how-to-use writeup
Academic year week counter Date & Time Tools Open Add/subtract days from date Date & Time Tools Open Age Calculator Calculate age Open Age Checker Date & Time Tools Open Age in days/hours/minutes calculator Date & Time Tools Open Alarm Clock Date & Time Tools Open Billing cycle calculator Date & Time Tools Open Birth flower finder by month Date & Time Tools Open Birthstone finder by month Date & Time Tools Open Business days calculator Date & Time Tools Open Calendar Generator Date & Time Tools Open Calendar generator (printable month) Date & Time Tools Open Chinese zodiac finder Date & Time Tools Open Conception date calculator Date & Time Tools Open Countdown Timer Count down to a date/time Open Countdown timer to holiday Date & Time Tools Open Date Difference Calculator Days between dates Open Date difference calculator (days between) Date & Time Tools Open Date to Julian date converter Date & Time Tools Open Day of the week finder (any date) Date & Time Tools Open Day of year calculator (1–365) Date & Time Tools Open Days until birthday calculator Date & Time Tools Open Days until retirement calculator Date & Time Tools Open Decimal hours to hh:mm converter Date & Time Tools Open Dog/cat age to human years converter Date & Time Tools Open Event duration calculator Date & Time Tools Open Fiscal Year Calculator Find fiscal year quarter and period-end dates from any fiscal-year start month. Open Golden hour calculator (photography) Date & Time Tools Open Historical date fact finder Date & Time Tools Open Holiday date finder by country/year Date & Time Tools Open Hours between two times Date & Time Tools Open Human date to Unix timestamp Date & Time Tools Open ISO week date converter Date & Time Tools Open Julian date to calendar date Date & Time Tools Open Leap year checker Date & Time Tools Open Meeting time planner (across zones) Date & Time Tools Open Military time (24h) converter Date & Time Tools Open Moon phase calculator Date & Time Tools Open Notice Period Calculator Calculate final working dates from notice length and optional weekend adjustment. Open Pay period date calculator Date & Time Tools Open Perpetual calendar viewer Date & Time Tools Open Probation Period End Date Calculator Calculate probation end dates first day off probation and review reminder dates. Open Quarter-End Date Calculator Calculate calendar or fiscal quarter start and end dates for any date. Open Ramadan & Eid Date Estimator Estimate Ramadan Eid al-Fitr and Eid al-Adha dates using the Umm al-Qura calendar. Open Season start/end dates Date & Time Tools Open Stopwatch Simple browser stopwatch Open Sunrise/sunset estimator Date & Time Tools Open Swatch Internet Time converter Date & Time Tools Open Time addition/subtraction tool Date & Time Tools Open Time card / timesheet calculator Date & Time Tools Open Time duration calculator (hh:mm:ss) Date & Time Tools Open Time Zone Converter Convert times between zones Open Time zone difference calculator Date & Time Tools Open UK Bank Holidays Calculator Generate UK bank holidays with Easter and substitute-day rules. Open Unix timestamp to human date Date & Time Tools Open US Federal Holidays Calculator Generate US federal holidays with weekend observance rules for any year. Open Week number finder Date & Time Tools Open Western zodiac sign finder Date & Time Tools Open Working hours calculator Date & Time Tools Open