# Days until daylight saving time

Counts the days from today, or any date you choose, to the next daylight saving time change, with its date and day of the week.

- Page: https://www.acalculator.org/days/days-until-daylight-saving-time
- JSON spec: https://www.acalculator.org/days/days-until-daylight-saving-time.json
- Version: e4a3dc7a3d85

## Default answer

Example with the default inputs (Count from September 30, 2026) on the example date Wednesday, September 30, 2026: From September 30, 2026, there are 32 days until the daylight saving time change on Sunday, November 1, 2026.

## Inputs

| Key | Label | Description |
| --- | --- | --- |
| from | Count from | The date to count from. Today, unless you change it. |

## Outputs

| Key | Label | Description |
| --- | --- | --- |
| days | Days until Daylight Saving Time | Whole days from the start date to the next daylight saving time change; 0 on the day itself. |
| date | Date | The next date of the daylight saving time change on or after the start date. |
| weekday | Day of the week | The weekday of that date. |
| weeks | In weeks | The same number of days in weeks and days. |
| detail | Clocks | Which way the clocks go on that date. |

## Method

Find the first date of the daylight saving time change on or after the start date, then count the days from the start date to it.

## Assumptions

- Since 2007, US clocks go forward one hour at 2:00 a.m. on the second Sunday of March (daylight saving time starts) and back one hour at 2:00 a.m. on the first Sunday of November (it ends). The dates come from your browser’s time zone data for New York.
- Hawaii and most of Arizona stay on standard time all year.
- Start dates from January 1, 1970 to December 31, 2400 work, because the time zone data holds every US clock change since 1970 (the March and November rule applies from 2007).
- The start date itself is not counted: from the day before, the count is 1; on the day itself, it is 0.
- Dates are calendar days with no time of day, so a time zone or a daylight-saving change never adds or loses a day.

## Worked examples

1. from = 2026-01-01 gives date = 2026-03-08, days = 66. Source: 15 U.S.C. 260a, as amended in 2005.
2. from = 2026-03-09 gives date = 2026-11-01, days = 237. Source: 15 U.S.C. 260a, as amended in 2005.
3. from = 2026-11-01 gives date = 2026-11-01, days = 0. Source: 15 U.S.C. 260a, as amended in 2005.
4. from = 2026-11-02 gives date = 2027-03-14, days = 132. Source: 15 U.S.C. 260a, as amended in 2005.

## FAQ

### When is the end of daylight saving time in 2026?

The end of daylight saving time in 2026 is on Sunday, November 1, 2026.

### When is the start of daylight saving time in 2027?

The start of daylight saving time in 2027 is on Sunday, March 14, 2027.

### Do the clocks go forward or back on Sunday, November 1, 2026?

Back: at 2:00 a.m. daylight time the clocks return to 1:00 a.m. standard time, and daylight saving time ends. You gain an hour that night.

### Which places in the US do not change their clocks?

Hawaii and most of Arizona stay on standard time all year (the Navajo Nation in Arizona does change), as do Puerto Rico, the US Virgin Islands, Guam, the Northern Mariana Islands, and American Samoa. Federal law (15 U.S.C. 260a) lets a state stay on standard time, but not on daylight time.

### How is the date of the daylight saving time change set?

Since 2007, US clocks go forward one hour at 2:00 a.m. on the second Sunday of March (daylight saving time starts) and back one hour at 2:00 a.m. on the first Sunday of November (it ends). The dates come from your browser’s time zone data for New York. Source: 15 U.S.C. 260a, as amended in 2005.

### How are the days until the daylight saving time change counted?

From the start date (today, unless you change it) to the date, without counting the start date. The day before, the count is 1; on the day itself, it is 0; the day after, the count moves on to the next daylight saving time change.

## Sources

- 15 U.S.C. 260a, as amended in 2005; IANA time zone database, America/New_York