What date was 1 month ago?
Work out the date 1 month before today, with a reference table for any starting date.
Working out today's date…
Worked from the 1st of each month of 2026
| Start date | Date it was | Day | Days | Working days |
|---|---|---|---|---|
| January 1, 2026 | December 1, 2025 | Monday | 31 | 23 |
| February 1, 2026 | January 1, 2026 | Thursday | 31 | 22 |
| March 1, 2026 | February 1, 2026 | Sunday | 28 | 20 |
| April 1, 2026 | March 1, 2026 | Sunday | 31 | 22 |
| May 1, 2026 | April 1, 2026 | Wednesday | 30 | 22 |
| June 1, 2026 | May 1, 2026 | Friday | 31 | 21 |
| July 1, 2026 | June 1, 2026 | Monday | 30 | 22 |
| August 1, 2026 | July 1, 2026 | Wednesday | 31 | 23 |
| September 1, 2026 | August 1, 2026 | Saturday | 31 | 21 |
| October 1, 2026 | September 1, 2026 | Tuesday | 30 | 22 |
| November 1, 2026 | October 1, 2026 | Thursday | 31 | 22 |
| December 1, 2026 | November 1, 2026 | Sunday | 30 | 21 |
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.
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 — or 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 calculator.
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.