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# Date minus (-) one month via formular

Hello,

I look for a BW formula to calculate a date - one month. At the moment I use the following formula but I'm not happy with this solution.

```IF( DATE_MONTH( CALDAY ) = DATE_MONTH( ADD_TO_DATE( LOAD_DATE, NEGATIVE( 15 ) ) ), WS_COUNT, 0 )
```

Regards, Thomas

##### Former Memberreplied

Here's a go at it using a routine. Not sure if the c's need to be i's for the calculations, so you may need to play around with it. Also this code doesn't check for validity of the 29th, 30th, 31st dates (March 31 going back to Feb 31 is invalid).

DATA: l_m1(2) type c,

l_m2(2) type c,

l_y(4) type c,

l_d(2) type c,

l_lastmonth like <date_field>.

l_y = <date_field>+0(4). "first 4 characters = year

l_m1 = <date_field>+4(2). "5-6 = month

l_d = <date_field>+6(2). "7-8 = day

l_m2 = l_m1 - 1. " get last month

IF l_m1 = 0. "check for january

l_m1 = 12.

l_y = l_y - 1.

ENDIF.

CONCATENATE l_y l_m1 l_d into l_lastmonth. "rebuild date

RESULT = l_lastmonth.

It's a start and a direction, so take it as such and not as the correct solution because I don't really know your requirements or exactly what you are trying to do.

Brian

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