PHP strtotime: Get previous month [duplicate]

Question

Possible Duplicate:
How to get previous month and year relative to today, using strtotime and date?

Today is December, 31st but strtotime("-1 months") returns December:

echo date("Y-m", strtotime("-1 months"));

Same for strtotime("last month")

How can I properly return the previous month (November)?

Test: http://codepad.viper-7.com/XvMaMB

Answer 1

strtotime("first day of last month")

The first day of is the important part as detailed on the Relative Formats manual page.

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Example: http://codepad.viper-7.com/dB35q8 (with hard-coded today's date)

Answer 2

strtotime("-1 months") would be 2012-11-31, but there's no November, 31st. It is one day past 2012-11-30, which gives 2012-12-01. You will see it, when you do

echo date("Y-m-d", strtotime("-1 months"));

gives as output

2012-12-01

See codepad