Days since calculator
How many days has it been? Enter any past date: a quit day, a first date, a move, a birth. Get the exact count and keep it as a live day counter.
What people count up from
- Days sober, with milestone chips
- Habit streaks: no smoking, daily runs, no social media
- Days together and the next 1,000-day mark
- A baby’s age in days, or your own (enter your birth date)
How the days are counted
By calendar date, ignoring time of day and daylight-saving changes. The standard count excludes the start date: an event yesterday was 1 day ago. The inclusive option adds one, matching how challenges and fellowships often number their days.
Questions people ask
How many days since a date?
Enter the date and the calculator counts the calendar days from it to today. Yesterday is 1 day ago.
Can I include the start date?
Tick “Count the start date as day 1”. That inclusive count is what “day 45 of my challenge” means.
How many days old am I?
Enter your date of birth. The result is your age in days; the tool also shows when you reach the next 1,000-day mark.
Can I keep the counter?
Press “Save to My countdowns”. It stays on this device and keeps counting up every day.