simple date function

[James C]

A1 contains a date, say 04/xx/13
I need A2 to parse A1, and output, regardless of the value of xx, the first day of the same month, thus "04/01/13"

thanks!

[Jonmo1]

=a1-day(a1)+1

[ChemistB]

or
=EOMONTH(A1,-1)+1
or
=DATE(YEAR(A1), MONTH(A1), 1)