Date & Time Calculators
Free tools to help you calculate dates, countdowns, and time conversions.
Date & Time Utilities is a free collection of online calculators for working with dates and time. Find the number of days between two dates, count down to a holiday, convert time units, calculate your age, or figure out how many business days fall in a date range. Every tool runs entirely in your browser — your data stays on your device, with no accounts, no tracking, and no ads blocking results.
Choose from the popular tools below or browse by category to find the calculator you need. Each page is designed to give you an instant, accurate answer with minimal input.
Popular Tools
Time Between Dates
Calculate the time between any two dates with optional time inputs.
Open calculator →Time Unit Converter
Convert between seconds, minutes, hours, days, weeks, and years.
Open calculator →Days Until Holiday
Countdown to any holiday — Christmas, Thanksgiving, Diwali, and more.
Open calculator →Countdown to Date
Create a countdown to any important date. Pick a date and optionally a time to see exactly how many days remain.
Open calculator →