Does the {CallLog.RecvdTime} field contain Date Time values stored as string in the this format:
YYYY -MM-DD and HH:MM:SS?
And, are you trying to convert the 'time' value in this string field to seconds? If yes, use this code:
Hour(cdatetime({CallLog.RecvdTime}))*3600 + Minute(cdatetime({CallLog.RecvdTime}))*60 + Second(cdatetime({CallLog.RecvdTime}))
-Abhilash