# Pick a date to see the day that is 30 days before it.

Pick a date and the day 30 days before it appears at once. The same count answers 30 days prior to a date and a date minus 30 days.

Pick a date

Today

30 days before the date

Sunday

September 27, 2026

30 days before Tuesday, October 27, 2026 is Sunday, September 27, 2026.

In weeks

4 weeks and 2 days

Weekdays crossed

21

Day of the year

Day 270

_Figure: A timeline of 30 days from Sun, Sep 27, 2026 to Tue, Oct 27, 2026. The picked date is Tue, Oct 27, 2026 and the answer is Sun, Sep 27, 2026._

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## The date you pick is day zero, and day 30 counting back is the answer.

The day before the date you pick is day 1, and the count runs to day 30. The date you pick is not counted and the answer is, which is how the date calculator counts too.

_Figure: The count for Thursday, December 31, 2026: day 0 is Dec 31 and is not counted, day 1 is Dec 30, day 2 is Dec 29, and day 30 is Dec 1, which is the answer._

30 days before Thursday, December 31, 2026 is Tuesday, December 1, 2026.

## Here is the date 30 days before every day of the next 12 months.

Each box shows a day of the month in bold and, under it, the date 30 days before that day. The 1st, the 15th and the last day of each month are also written out as sentences.

### Here is the date 30 days before each day of October 2026.

The small dates fall in 2026.

October 2026: each box shows the day of the month and, under it, the date 30 days before that day

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1Sep 1

2Sep 2

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27Sep 27

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30Sep 30

31Oct 1

-   30 days before Thursday, October 1, 2026 is Tuesday, September 1, 2026.
-   30 days before Thursday, October 15, 2026 is Tuesday, September 15, 2026.
-   30 days before Saturday, October 31, 2026 is Thursday, October 1, 2026.

### Here is the date 30 days before each day of November 2026.

The small dates fall in 2026.

November 2026: each box shows the day of the month and, under it, the date 30 days before that day

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-   30 days before Sunday, November 1, 2026 is Friday, October 2, 2026.
-   30 days before Sunday, November 15, 2026 is Friday, October 16, 2026.
-   30 days before Monday, November 30, 2026 is Saturday, October 31, 2026.

### Here is the date 30 days before each day of December 2026.

The small dates fall in 2026.

December 2026: each box shows the day of the month and, under it, the date 30 days before that day

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1Nov 1

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30Nov 30

31Dec 1

-   30 days before Tuesday, December 1, 2026 is Sunday, November 1, 2026.
-   30 days before Tuesday, December 15, 2026 is Sunday, November 15, 2026.
-   30 days before Thursday, December 31, 2026 is Tuesday, December 1, 2026.

### Here is the date 30 days before each day of January 2027.

The small dates fall in 2026 and 2027.

January 2027: each box shows the day of the month and, under it, the date 30 days before that day

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31Jan 1

-   30 days before Friday, January 1, 2027 is Wednesday, December 2, 2026.
-   30 days before Friday, January 15, 2027 is Wednesday, December 16, 2026.
-   30 days before Sunday, January 31, 2027 is Friday, January 1, 2027.

### Here is the date 30 days before each day of February 2027.

The small dates fall in 2027.

February 2027: each box shows the day of the month and, under it, the date 30 days before that day

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-   30 days before Monday, February 1, 2027 is Saturday, January 2, 2027.
-   30 days before Monday, February 15, 2027 is Saturday, January 16, 2027.
-   30 days before Sunday, February 28, 2027 is Friday, January 29, 2027.

### Here is the date 30 days before each day of March 2027.

The small dates fall in 2027.

March 2027: each box shows the day of the month and, under it, the date 30 days before that day

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1Jan 30

2Jan 31

3Feb 1

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31Mar 1

-   30 days before Monday, March 1, 2027 is Saturday, January 30, 2027.
-   30 days before Monday, March 15, 2027 is Saturday, February 13, 2027.
-   30 days before Wednesday, March 31, 2027 is Monday, March 1, 2027.

### Here is the date 30 days before each day of April 2027.

The small dates fall in 2027.

April 2027: each box shows the day of the month and, under it, the date 30 days before that day

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-   30 days before Thursday, April 1, 2027 is Tuesday, March 2, 2027.
-   30 days before Thursday, April 15, 2027 is Tuesday, March 16, 2027.
-   30 days before Friday, April 30, 2027 is Wednesday, March 31, 2027.

### Here is the date 30 days before each day of May 2027.

The small dates fall in 2027.

May 2027: each box shows the day of the month and, under it, the date 30 days before that day

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31May 1

-   30 days before Saturday, May 1, 2027 is Thursday, April 1, 2027.
-   30 days before Saturday, May 15, 2027 is Thursday, April 15, 2027.
-   30 days before Monday, May 31, 2027 is Saturday, May 1, 2027.

### Here is the date 30 days before each day of June 2027.

The small dates fall in 2027.

June 2027: each box shows the day of the month and, under it, the date 30 days before that day

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-   30 days before Tuesday, June 1, 2027 is Sunday, May 2, 2027.
-   30 days before Tuesday, June 15, 2027 is Sunday, May 16, 2027.
-   30 days before Wednesday, June 30, 2027 is Monday, May 31, 2027.

### Here is the date 30 days before each day of July 2027.

The small dates fall in 2027.

July 2027: each box shows the day of the month and, under it, the date 30 days before that day

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1Jun 1

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31Jul 1

-   30 days before Thursday, July 1, 2027 is Tuesday, June 1, 2027.
-   30 days before Thursday, July 15, 2027 is Tuesday, June 15, 2027.
-   30 days before Saturday, July 31, 2027 is Thursday, July 1, 2027.

### Here is the date 30 days before each day of August 2027.

The small dates fall in 2027.

August 2027: each box shows the day of the month and, under it, the date 30 days before that day

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31Aug 1

-   30 days before Sunday, August 1, 2027 is Friday, July 2, 2027.
-   30 days before Sunday, August 15, 2027 is Friday, July 16, 2027.
-   30 days before Tuesday, August 31, 2027 is Sunday, August 1, 2027.

### Here is the date 30 days before each day of September 2027.

The small dates fall in 2027.

September 2027: each box shows the day of the month and, under it, the date 30 days before that day

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-   30 days before Wednesday, September 1, 2027 is Monday, August 2, 2027.
-   30 days before Wednesday, September 15, 2027 is Monday, August 16, 2027.
-   30 days before Thursday, September 30, 2027 is Tuesday, August 31, 2027.

## The other direction and the other lengths have their own pages.

[See 30 days after a date instead](https://www.teampredict.ai/tools/date-calculator/30-days-after-a-date)

-   [14 days (2 weeks) before a date](https://www.teampredict.ai/tools/date-calculator/14-days-before-a-date)
-   [28 days (4 weeks) before a date](https://www.teampredict.ai/tools/date-calculator/28-days-before-a-date)
-   [45 days before a date](https://www.teampredict.ai/tools/date-calculator/45-days-before-a-date)
-   [60 days before a date](https://www.teampredict.ai/tools/date-calculator/60-days-before-a-date)
-   [90 days before a date](https://www.teampredict.ai/tools/date-calculator/90-days-before-a-date)
-   [180 days before a date](https://www.teampredict.ai/tools/date-calculator/180-days-before-a-date)

If the date is today, the [30 days ago](https://www.teampredict.ai/tools/date-calculator/30-days-ago) page gives the answer for today's date. The [date calculator](https://www.teampredict.ai/tools/date-calculator) takes a question in plain words, such as 90 days before January 31 2027 or 10 days before Nov 3, and the [days between dates calculator](https://www.teampredict.ai/tools/days-between-dates-calculator) counts the gap between two dates.

## Here are five questions about 30 days before a date, answered.

What is 30 days before a date?

Count back 30 days from the date, with the date itself as day zero. For example, 30 days before Thursday, December 31, 2026 is Tuesday, December 1, 2026.

Is 30 days prior to a date the same as 30 days before it?

Yes. 30 days before a date, 30 days prior to a date and a date minus 30 days all ask for the same day. For Thursday, December 31, 2026, all three give Tuesday, December 1, 2026.

Does 30 days before a date count the date itself?

No. The date you pick is day zero, the next day back is day 1 and day 30 is the answer, so the answer is counted and the date you pick is not. If a policy or contract counts the date you pick as day 1, the answer moves one day later, to Wednesday, December 2, 2026 for Thursday, December 31, 2026.

Is 30 days before a date the same as one month before it?

Not always. For Thursday, December 31, 2026, one month before it is Monday, November 30, 2026, which is 31 days away, while 30 days before it is Tuesday, December 1, 2026. A month runs from 28 to 31 days.

Can I type the date as 1/31/2027 or January 31 2027?

The date field above uses your device's date format. To type the whole question in words, such as 30 days before January 31 2027 or 30 days prior to 1/31/2027, use the question box on the date calculator.

## Turnover is cheaper to prevent than to calculate.

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