Dear Omika,
No, as you said the employee was present on Saturday, Half Day. Therefore, Sunday to be counted as W/Off. and his leave start from Monday only.
However, If you have added any relevant clause / condition in your company leave policy, under the light of that clause you may take decision.
***Clause such as.... ''Privilege Leave, Casual Leave and Weekly Off [All three] cannot be combined together''.
If such clause is available in your company leave policy then, Saturday to be marked as half day Absent, Sunday to be counted as W/Off. and his leave start from Monday
Thanks,
Ubaid Raheman