# Date Calculator

> Count the days between two dates, or add and subtract days from any date.

URL: https://uttir.com/date-calculator
Categories: calculators
Privacy: Date math runs locally in your browser.

## About

Two date utilities in one: the gap between any two dates (in days, with week/month/year equivalents), and a date shifter that adds or subtracts a number of days — useful for deadlines, due dates, and countdowns.

All math respects real calendar dates, including month lengths and leap years, and uses your local timezone so a date you pick is the date you mean.

## How to use

1. **Difference** — Pick From and To dates to see the gap in days and equivalents.
2. **Shift a date** — Pick a starting date and a day offset; negative values go backwards.

## Examples

### January gap

From 1 Jan to 31 Jan.

Input:

```
2026-01-01 → 2026-01-31
```

Output:

```
30 days
```

### Due date

30 days after 30 Jan 2026 crosses the month boundary.

Input:

```
2026-01-30 + 5
```

Output:

```
Wed, Feb 4, 2026
```

## FAQ

### Are the results timezone-aware?

Yes. Dates are interpreted in your local timezone, so there is no off-by-one-day surprise from UTC conversion.

### Why are months and years approximate?

Months vary in length, so gaps longer than a few weeks are expressed using average month (30.44 days) and year (365.25 days) lengths.

### Does it count business days?

Yes. There is a toggle to exclude weekends, and an option to add a list of holidays. The result is the number of business days between two dates.

### How are weekends and holidays counted?

Weekends are Saturday and Sunday in any locale. Public holidays are not counted — the tool gives business-day (Mon–Fri) and total-day counts separately so you can add holidays yourself if needed.

## Related tools

- [Age Calculator](https://uttir.com/age-calculator) — Find the exact age in years, months, and days — plus totals and the countdown to the next birthday.
- [Time Zone Converter](https://uttir.com/time-zone-converter) — Convert times between time zones and compare them side by side.
- [Unix Timestamp Converter](https://uttir.com/unix-timestamp-converter) — Convert Unix timestamps to readable dates and back, with a live current-time readout.

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For the full HTML page with the live tool, visit https://uttir.com/date-calculator.
This file is the markdown rendering at https://uttir.com/date-calculator.md. See https://uttir.com/llms.txt for a site-wide summary.