Informix DataBlade API Programmer's Manual DataBlade API Function Descriptions

The dtsubinv() function subtracts an interval value from a datetime value. The result is a datetime value.

mint dtsubinv(dt, inv, res)

	dtime_t *dt;

	intrvl_t *inv;

	dtime_t *res;

 



dt

is a pointer to an initialized datetime variable.


inv  

is a pointer to an initialized interval variable.


res

is a pointer to the datetime variable that contains the result.

The dtsubinv() function subtracts the interval value in inv from the datetime value in dt and stores the datetime value in res. This result inherits the qualifier of dt.

The datetime value must include all the fields present in the interval value. When you do not initialize the variables dt and inv, the function might return an unpredictable result.