What does Prev Month Same Day do that other Date & time pages on this site do not?

Subtracts one calendar month, clamping the day, and returns weekday, day, and year. Short version: Previous month same day with weekday and year.

Does Prev Month Same Day upload my file or text to Tool-You servers?

No. Prev Month Same Day runs in this browser tab. Files stay on the device. Limit note: Local YMD only. Day clamps when the previous month is shorter.

Should I use Next Month Same Day instead of Prev Month Same Day?

Use Prev Month Same Day when you need Previous month same day with weekday and year. Use Next Month Same Day when you need Next month same day with weekday and year. They share a category (Date & time) but not the same job.

What are the limits of Prev Month Same Day?

Local YMD only. Day clamps when the previous month is shorter. Also: Subtracts one calendar month, clamping the day, and returns weekday, day, and year.

Prev Month Same Day

Previous month same day with weekday and year.

Subtracts one calendar month, clamping the day, and returns weekday, day, and year.

What Prev Month Same Day does

Subtracts one calendar month, clamping the day, and returns weekday, day, and year.

Practical limit for Prev Month Same Day: Local YMD only. Day clamps when the previous month is shorter. That is why output can differ from heavy desktop Date & time software. Read the tool-specific note again: Subtracts one calendar month, clamping the day, and returns weekday, day, and year.

How to use Prev Month Same Day

Confirm you need Prev Month Same Day, not Next Month Same Day (Next month same day with weekday and year.). Address: /datetime/prev-month-same-day.
Enter the numbers or dates Prev Month Same Day uses. Previous month same day with weekday and year.
Read the result as Prev Month Same Day defines it — not as Add Months (Add months; shows result weekday.). Subtracts one calendar month, clamping the day, and returns weekday, day, and year.
Prev Month Same Day is an estimate in the browser, not professional advice. Local YMD only. Day clamps when the previous month is shorter.
Need a different formula? Try Add Months (Add months; shows result weekday.) instead of stretching Prev Month Same Day.

When not to use Prev Month Same Day

Skip Prev Month Same Day when a neighbor tool matches better — start with Next Month Same Day or Add Months — or when the description already warns the job will fail. In the tool’s own words: Subtracts one calendar month, clamping the day, and returns weekday, day, and year.

Questions about Prev Month Same Day

What does Prev Month Same Day do that other Date & time pages on this site do not?: Subtracts one calendar month, clamping the day, and returns weekday, day, and year. Short version: Previous month same day with weekday and year.
Does Prev Month Same Day upload my file or text to Tool-You servers?: No. Prev Month Same Day runs in this browser tab. Files stay on the device. Limit note: Local YMD only. Day clamps when the previous month is shorter.
Should I use Next Month Same Day instead of Prev Month Same Day?: Use Prev Month Same Day when you need Previous month same day with weekday and year. Use Next Month Same Day when you need Next month same day with weekday and year. They share a category (Date & time) but not the same job.
What are the limits of Prev Month Same Day?: Local YMD only. Day clamps when the previous month is shorter. Also: Subtracts one calendar month, clamping the day, and returns weekday, day, and year.