Datumrekenmachine
Hoeveel dagen zijn er sinds 1 januari voorbij? Kies 1 januari als startdatum en vandaag als einddatum om ze te tellen. Deze datumrekenmachine telt de dagen tussen twee willekeurige datums, of telt dagen bij een datum op, inclusief schrikkeljaren.
Resultaat
Vul waarden in en tik op Berekenen om het resultaat te zien.
Formule
Dates are counted as whole calendar days, including leap days (the end date is not counted twice).
Zo gebruik je deze rekenmachine
- Choose the mode and pick the dates.
- The difference counts from the start date up to (not including) the end date.
Uitgewerkte voorbeelden
Days from 1 January to 25 December 2026
25 December is day 359 of 2026, and 1 January is day 1.
So there are 358 days between them: 51 weeks and 1 day.
Easy: days since 1 January, counted on 1 June 2026
January 31 + February 28 + March 31 + April 30 + May 31 = 151 days.
So on 1 June 2026 it had been 151 days since January 1.
Medium: days since January 1, 2025
From 1 January 2025 to 1 January 2026 is 365 days (2025 isn’t a leap year).
From 1 January to 2 November 2026 is 305 more days, so the total is 670 days.
Hard: across a leap day
2024 is a leap year, so February has 29 days.
January 31 + February 29 = 60 days from 1 January to 1 March.
Veelgemaakte fouten
- Counting both the start and end dates: from 1 January to 2 January is 1 day.
- Forgetting leap years: years divisible by 4 have 29 February, except century years not divisible by 400.
- Using 30-day months: real months have 28 to 31 days, so always count the actual calendar.
Veelgestelde vragen
How many days ago was January 1?
Put 1 January of this year as the start date and today as the end date. On 2 November 2026, for example, January 1 was 305 days ago.
Are leap years handled?
Yes — every date is converted to an exact calendar day count.
Does it count the end date?
No. From Monday to Tuesday is 1 day. Add 1 if you want to include both ends.