Hello! The attendance period should be from the 16th to the 15th of every month. To credit the salary well in time, i.e., by the end of the month, 15 days' salary is paid in advance by most of the corporates, assuming the presence of 15 days in advance. If there is any absence between the 16th and the 30th for which the salary is paid in advance, the absentees, if any, can be adjusted in the next month's salary.
In short, for salary calculation, attendance from the 16th to the 15th is considered to pay salary for a particular month. Advance salary paid for 15 days can be adjusted in the next month's salary.
Regards,
U S Rauthan