Date Calculator

This date calculator online works out the difference between two dates and adds or subtracts days, months and years from a date. Use it to find how many days are left until an event, how long ago something happened, a deadline that falls a set number of days from today, or the exact time between a start and end date. It helps with project planning, contract terms, visa and notice periods, pregnancy and travel timelines, and everyday questions like how many weeks until a holiday. You pick your dates, and the tool shows the result in days, months and years so you do not have to count a calendar by hand. It also helps you avoid leap year and month length mistakes. The tool runs in your browser, needs no account and does not send your dates to a server. It is free and works offline once the page has loaded. For legal or financial deadlines, double check the result against the rules that apply to you.