Hello Indu,
All the fraternity members have given the correct answer to your query, but I see total logic in Madhu's post. Let me explain.
Your organization is working for half-a-day on 1st & 3rd Saturday of the month. Now, if there is somebody who is remaining absent on either of these days, then the answer to whether this absence should be considered as full-day / half-day absence depends upon the type of employment this employee has with the organization. What kind of employee is he? Is he paid for hourly, daily or monthly basis ?
#If hourly basis employees remain absent on 1st & 3rd Saturdays, then obviously they'll lose salary (wages) for half a day (or for those many number of hours for which they were supposed to work on Saturday).
#For employees on daily wages, you need to check what they get (rather what your organization pays) for working on these saturday's. Accordingly, they stand to loses the salary for remaining absent of those Satudays.
#However, those on monthly basis (irrespective of whether it's a half-day working / full-day working) gets paid for the full month. So, any absence on Saturday's should be considered as "full-day" absent.
Cheers,
A.B.