# How many days since a date - a day counter

Enter a date and see how many days have passed: since a diet started, since you quit, since the first day of a new job. If it is meant to last a set time, give the plan and the counter says how many days are left and how far along you are. No account, nothing sent to our server.

## Days since New Year, 1 September and Christmas

- **Since New Year** (1 January 2026, Thursday): 307 days, or 43 weeks and 6 days.
- **Since 1 September** (1 September 2026, Tuesday): 64 days, or 9 weeks and 1 day.
- **Since Christmas** (25 December 2025, Thursday): 314 days, or 44 weeks and 6 days.

## How the days are counted

The starting day is zero, so yesterday reads one. A three month plan is 90 days, taking a month as 30, so that "three months" and "90 days" mean the same thing here.

Where these numbers come from: [How many days has it been? Counting from a date, and why the counter works](https://ordiarion.com/blog/counting-days-since-a-date)

## Common questions

### How do I count the days since a date?

Subtract the start date from today. The starting day counts as zero, so something that began yesterday has lasted one day. The calculator does it for you, leap years included.

### How many days are three months?

Ninety here, taking a month as 30 days. Three calendar months run from 89 to 92 days depending on which months they are.

### Is the counter saved anywhere?

Not on this page: the date stays in your browser for the visit. An Ordiarion account has a counters module that keeps them on every device and shows the progress of a plan.

### How is this different from a countdown?

The direction. A countdown counts to a date ahead: the holidays, Christmas. This counts from a date behind: since a diet started, since you quit, since you moved.

## Read more

- [How many days has it been? Counting from a date, and why the counter works](https://ordiarion.com/blog/counting-days-since-a-date)
- [How long does it take to form a habit? Not 21 days](https://ordiarion.com/blog/how-long-to-form-a-habit)

---

https://ordiarion.com/en/tools/days-since