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What date was 1 month ago?

Work out the date 1 month before today or any date you pick, with a reference table by month.

1 month ago

Working out today's date…

1 month before another date

Pick a start date to see the result.

1 month before any date

Worked from the 1st of each month of 2026

Start dateDate it wasDayDaysWorking days
January 1, 2026December 1, 2025Monday3123
February 1, 2026January 1, 2026Thursday3122
March 1, 2026February 1, 2026Sunday2820
April 1, 2026March 1, 2026Sunday3122
May 1, 2026April 1, 2026Wednesday3022
June 1, 2026May 1, 2026Friday3121
July 1, 2026June 1, 2026Monday3022
August 1, 2026July 1, 2026Wednesday3123
September 1, 2026August 1, 2026Saturday3121
October 1, 2026September 1, 2026Tuesday3022
November 1, 2026October 1, 2026Thursday3122
December 1, 2026November 1, 2026Sunday3021

The "Days" column varies because calendar months are not the same length — 1 month spans between 28 and 31 days depending on where in the year you start.

Other date offsets

1 Month From Today the other direction3 Months Ago 6 Months Ago 9 Months Ago Date Difference Calculator any two dates

The answer at the top of this page is worked out in your browser against today's date, so it is always current — there is no cached "today" baked into the page.

1 month is not a fixed number of days: depending on which months it spans it covers between 28 and 31 days. That is why calendar arithmetic in months is done by moving the month number rather than by adding days.

Calendar arithmetic is less obvious than it looks. Subtracting 1 month from January 1, 2026 gives December 1, 2025, while the same offset from July 1, 2026 gives June 1, 2026, a different number of calendar days later, because the months in between are different lengths. The table above lists the result from the 1st of every month of 2026 so you can read off the pattern directly.

For an offset from a date other than today, enter it in the start-date box above. To measure the gap between two dates you already have, use the date difference calculator.

How many days is 1 month?

1 month is not a fixed number of days: depending on which months it spans it covers between 28 and 31 days. That is why calendar arithmetic in months is done by moving the month number rather than by adding days.

What is 1 month before January 1, 2026?

Monday, December 1, 2025. The table on this page lists the answer from the 1st of every month of 2026; for any other start date, use the start-date box at the top of the page.

What is 1 month before a specific date?

Enter the date in the "1 month before another date" box on this page: it shows the date 1 month earlier, its weekday, and the working days in between. The month moves and the day of the month stays, clamped to the last day where the target month is shorter.

How many working days is 1 month?

Between 20 and 23, depending on the start date and which weekends and month lengths the span covers. Public holidays are not excluded.

What date is 1 month from today?

That is the same distance in the other direction — see the 1 month from today page for a live answer and its own reference table.