OSSetEnvironmentTIMEDATE
Function : OS Environment Variables
OSSetEnvironmentTIMEDATE - Set a given environment variable to a provided TIMEDATE value.
#include <osenv.h>
void OSSetEnvironmentTIMEDATE(
    const char *EnvVariable,
    TIMEDATE *td);
Set a TIMEDATE for an environment variable. This routine writes the given TIMEDATE into the given environment variable. If NULL is provided for a value to set, the current TIMEDATE is sent the to the given environment variable.
Parameters : Input : EnvVariable - Name of environment variable (ASCIZ).
td - TIMEDATE to set.
Sample Usage :
    /* LastWeekFriday is a TIMEDATE set to a date in the past, say.*/ 
    OSSetEnvironmentTIMEDATE ("LAST_FRIDAY_DATE", &LastWeekFriday); 
    OSSetEnvironmentTIMEDATE ("TODAY_DATE", NULL);