Why is January 1 shown as 0%?

The percentage counts complete days. On January 1, zero full days of the year have elapsed yet — the day is in progress. By the same logic, December 31 reads ~99.7% rather than 100%, because the last day itself is still in progress.

Are leap years handled?

Yes. The calculator detects leap years (divisible by 4 except century years not divisible by 400) and uses 366 instead of 365 as the denominator. February 29 falls on day 60 of a leap year.

How is day of year calculated?

Day of year is the count from January 1 inclusive: January 1 is day 1, February 1 is day 32, December 31 is day 365 (or 366 in a leap year).

How is week of year calculated?

Week of year is computed as the ceiling of day-of-year divided by 7, so days 1–7 are week 1, days 8–14 are week 2, and so on. This is a simple non-ISO scheme — it does not align with ISO 8601 week numbering, which can place early-January days in the previous year's week 52.

Can I use a future date?

Yes. Set the reference date to any past or future date and the calculator will show the year progress at that point. Useful for planning milestones or seeing how a target date sits in the year.

DATDate & Time

Year Progress Calculator

See what percentage of the calendar year has elapsed by any given date. Shows day of year, week of year, and days remaining — leap-year aware.

Reference date(optional)

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How It Works

Formula

\text{percentComplete} = \frac{\text{dayOfYear} - 1}{\text{daysInYear}} \times 100

\text{daysRemaining} = \text{daysInYear} - \text{dayOfYear}

\text{weekOfYear} = \lceil \text{dayOfYear} / 7 \rceil

Where

$\text{dayOfYear}$: Day number within the year, counting January 1 as day 1
$\text{daysInYear}$: Total days in the year — 365, or 366 in a leap year
$\text{percentComplete}$: Share of the year already elapsed before the reference date
$\text{weekOfYear}$: Week number from January 1, computed as ⌈dayOfYear / 7⌉

Enter a date (or leave blank to use today). The calculator counts how many complete days of the calendar year have passed before that date and divides by the year's length (365 or 366 if it's a leap year). January 1 reads 0%, December 31 reads ~99.7% — the final day itself is still in progress.

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