# 3547 Adding Month Intervals to Certain Dates/Timestamps Can Cause Incorrect Results

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The MONTH intervals seem to be, at least weird, if it is not buggy.

If I add '1' MONTH to 2012-01-01 I expected what I got, 2012-02-01.

If I add '1' MONTH to 2012-01-30 I did not expected what I got, 2012-03-01. It seems I started in January and I ended up in March, which calendaristically is kind of 2 months later.

Also, if I subtract '1' MONTH from 2012-03-30, again, I did not expected what I got, 2012-03-01. It seems I started in March and after taking out 1 month, I am still in March.