Dear friend,
He is eligible for earned leave for the period from January to June, and you have to give one day for every 20 days worked by him if he has completed 66.66% attendance. For example, if the number of workdays from January to June was 152 and he worked 110 days, then the calculation will be: 110 / 152% = 72.36. In this case, he will be eligible. However, if he worked for 90 days, then the calculation would be: 90 / 152% = 59.12, and in this situation, he will not be eligible. Now you can calculate as per the working days.
Zakir Hussain