Day counter: days since, or until, any date.
dayLime's day counter is a free web calculator: enter a date and read the days passed since it or left until it.
Set a time of day
How many days have passed since a date?
Pick the start day and get the days passed since it, as D+N, plus the same span in weeks and months.
How many days are left until a date?
Enter a date for a countdown to it: the days left, plus the span in weeks and months.
How does the day counter calculate the days?
The calculator compares calendar dates, not hours. Days since gives D-Day for the start day by default, then D+1. Switch to Start at D+1 and the first day itself is D+1, as in the dayLime app. Days until leaves out the target date itself. Today comes from your device clock.
Read the start day as
- D-Day
- D+1
- D+2
- D+3
- D+1
- D+2
- D+3
- D+4
What people ask about the day counter.
Is the start day D-Day or D+1?
You can choose. By default the start day reads D-Day and the next day D+1. Pick Start at D+1 under Display in the D-Day settings and the start day itself reads D+1, so a 100 day challenge begins at D+1. A third way, Count down to goal, counts the days left until your goal date.
Does days since count the start day?
Both work. In the default mode the first day is D-Day and the next is D+1. Select Start at D+1 and day one is the start day itself, then day 2. If you started on 2026-09-27, then on 2026-10-04 it is D+7 by default, or day 8 with Start at D+1.
Does days until count today?
No. Days until counts the days from today to the target date, and the target date itself is not added. On 2026-10-04 the date 2026-10-14 is 10 days left.
What if the start date is in the future?
Days since shows how many days away that date is, because the start day has not come yet.
How long ago was a date?
Enter it under days until. If the date has passed, the result says how many days ago it was. If it is today, the result says that day is today.
Does the calculator handle leap years?
Yes. It counts calendar dates, so 29 February is counted in a leap year. From 2024-02-28 to 2024-03-01 is 2 days, and from 2023-02-28 to 2023-03-01 is 1 day.
Which time zone does the calculator use?
Your device's. Today's date is read from your device and only calendar dates are compared, not hours, so a daylight saving change cannot shift the count.
How are weeks and months worked out?
Weeks are whole seven-day weeks plus the leftover days. Months are whole calendar months plus the leftover days. Both use the time between the two dates, so 7 days after the start day is 1 week and 0 days.
Put the count on your photos.
First 2 slots free forever · iOS & Android