FM to calculate busines time stamps

Hi friends,

I need to calculate the cycle time of two time stamps. I do know one FM,

SD_DATETIME_DIFFERENCE, which gives the cycle time in days and hours. But this FM also includes weekends. My requirement is not to include weekends. I require the similar result as the fm SD_DATETIME_DIFFERENCE gives but it should ONLY consider week days. Can anyone suggest me any FM which fulfils my requirement ?

Thanks in advance

Reddy