Dear Sacheein,
The 240 days rule is a very controversial rule on which different High Courts have their different views. However, I will try to explain this to you.
In my opinion, if you are paying any daily-rated employee weekly or monthly on a voucher basis, you should calculate their days as 30 per month while calculating 240 days. The reason being that this rule is governed by the respective Shops and Establishment Acts of different states, and more or less, one section related to close day or weekly off is the same in every act. For example, I reproduce the sections from the Delhi Shops and Establishment Act.
"17. Period of rest (weekly holiday).—Every employee shall be allowed at least twenty-four consecutive hours of rest (weekly holiday) in every week, which shall, in the case of shops and commercial establishments required by this Act to observe a close day, be on the close day.
18. Wages for the holiday.—No deduction shall be made from the wages of any employee on account of the close day under section 16 or a holiday granted under section 17 of this Act.
If an employee is employed on a daily wage, he shall nonetheless be paid his daily wage for the holiday, and where an employee is paid on piece rates, he shall receive the average of the wages received during the week."
Section 18 clears all the ambiguity on the subject. Please also see the definition of workman in the act, reproduced here:
(7) "employee" means a person wholly or principally employed, whether directly or otherwise, and whether for wages (payable on permanent, periodical, contract, piece-rate or commission basis) or other consideration, about the business of an establishment and includes an apprentice and any person employed in a factory but not governed by the Factories Act, 1948 (43 of 1948), and for the purpose of any matter regulated by this Act, also includes a person discharged or dismissed whose claims have not been settled in accordance with this Act;
The definition of "employee" itself says any person wholly or principally employed, whether directly or otherwise, and whether for wages payable on permanent, periodical, contract, piece rate or commission basis. Here, the daily wager will fall in the category of periodical paid employee. PLEASE KEEP THIS IN MIND THAT LABOUR LEGISLATION IS A BENEFICIAL LEGISLATION, SO FOR EVERY SECTION WE HAVE TO GIVE THE MOST LIBERAL INTERPRETATION POSSIBLE. Going as per this rule, the daily-rated employees are also entitled to the wages for their weekly off, IF THEIR EMPLOYMENT LASTS FOR AT LEAST 6 DAYS IN A WEEK.
One more suggestion: if you are not paying your daily-rated employees the payment for weekly off, please start paying it to avoid any unfavorable situation, or pay them off daily at the end of the day on a voucher for their wages for the day.
Hope this will clear the situation. Suggestions and further points of view are invited to enlighten the knowledge.
Thanks,