MySQL update just day in date column in many rows -


having rows:

1|2015-04-22 2|2015-03-11 3|2015-02-15

i want update on rows day, example: 

1|2015-04-25 2|2015-03-25 3|2015-02-25

it looks want keep year , month same, , change days 25th of whichever year , month shown.

the formula need 

date(date_format(datecolumn, '%y-%m-25'))

so, update table it's

update mytable set datecolumn =  date(date_format(datecolumn, '%y-%m-25'))

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