Pick any two dates and see exactly how far apart they are — in days, weeks, months, and years.
The calculator measures the span between the two dates at midnight in your timezone. By default it counts the days between the dates (exclusive of the end date) — that's the convention most people mean when they say "how many days until…". Tick the checkbox if you want the end date included, which is common for project timelines and booking nights ("we're staying 5 nights" means 6 calendar days, for example).
The weekday count is a simple Monday-through-Friday tally and doesn't subtract public holidays, which vary by country and year. For contract or payroll questions, confirm holiday calendars with the relevant authority.
People use this tool to count down to trips, measure notice periods, check how long ago an event happened, plan project timelines, and figure out "how many days until my due date". All calculation happens in your browser — nothing you enter is sent anywhere.
From Monday, January 5, 2026 to Friday, January 9, 2026, the gap is 4 days — the calculator measures from the start of the first date to the start of the second. The weekdays inside that gap are Monday through Thursday: 4 of them. Now tick "Include the end date" and both numbers rise by one, to 5 days and 5 weekdays, because Friday the 9th itself joins the count. If a weekday figure ever surprises you, that checkbox is the first thing to check.
Days and weeks are exact counts, but months are lumpy — they run from 28 to 31 days. The calendar-months figure counts whole month boundaries crossed by comparing the day numbers of the two dates. So January 31 to February 28 shows as 28 days but 0 whole calendar months, because the 28th never reaches the 31st's day number. Neither figure is wrong; they answer slightly different questions, and for deadlines the day count is the one to trust.
Does the order of the dates matter? No. If you enter the later date first, the calculator quietly swaps them and measures the same gap.
Does the weekday count skip public holidays? It counts every Monday to Friday, holidays included, because holiday calendars differ by country, state, and employer. If you need true business days for a contract or a court deadline, subtract your local holidays from the weekday figure.
How far apart can the dates be? As far as the date pickers allow. Spans of decades or centuries work fine, and every leap year inside the span is counted automatically.