Understanding Leave Policies Under the Factories Act
If you follow the Factories Act, the weekly holidays or holidays intervening between two annual leaves (earned leave) should not be counted as leave. This means no kind of sandwiching is possible in the case of earned leaves. This is because the earned leave is "earned" based on the number of days worked in the preceding year. The number of days worked for this purpose does not include any weekly off days or holidays.
Leave Policies Under the Shops and Commercial Establishments Act
If your organization is a shop coming under the state's Shops and Commercial Establishments Act, there can be some differences. However, in respect of earned leaves, many states have a common rule that the holidays coming in between two earned leaves should not be counted as leave. Instead, the holiday or weekly off, as the case may be, shall be allowed as such.
Casual and Sick Leave Policies
At the same time, casual leave and sick leaves, which are admissible in numbers, say 12 days or 7 days per annum, have no bearing on the days worked in the preceding year and are not earned, can be sandwiched. The logic is that sick leave is taken when an employee falls sick. If an employee is sick on Saturday and Monday, it is logical to assume they are sick on Sunday as well, and they cannot claim to be well on Sunday.