Date & time toolkit
What do you want to calculate?
Pick a question, filter to the exact tool, and get an instant answer — right in your browser.
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.
Pick one of the questions above, then filter to the exact calculator you need. Each page is designed to give you an instant, accurate answer with minimal input.