Sending a notification at a certain day at a certain time

I have this for now as a condition for To do notification in VB
Weekday(‹WF_SYSTEM_DATE>)=CInt(<REQUEST_DAY>) And <WF_SYSTEM_TIME>=“08:00:00”

I want the notification to hit certain days of the week. The <REQUEST_DAY> returns either 3 or 5 for Tuesday or Thursday. I’m unsure about the format of <WF_SYSTEM_TIME>. I want the notification to go at 8 AM. I need help