Date & Time Calculators
Browse Date & Time calculators.
Age Calculator
Use this free Age Calculator to calculate age with clear inputs, instant results, useful supporting data and an explanation of the method.
Birthday Countdown
Calculate how many days until your next birthday. Find your upcoming birthday date, weekday, age and countdown in weeks, hours and minutes.
Date Difference Calculator
Calculate elapsed days between two dates, a span in years, months and days, and weekday and weekend totals.
Day of Week Calculator
Find the day of the week for a calendar date, including its ISO week number, day of the year, leap-year status and calendar quarter.
Week Number Calculator
Find the ISO week number and week year of a date, with the week start, week end and ISO week-date notation.