You have posted that:
"Establishment wotks for 06 days a week.
01 months is the notice period. but they may relieve me immediately
I am about submit my resignation on 15.07.2015."
As per Sec;2A Payment of Gartuity Act; You should have worked for 240 days in 5th year.
You may submit notice of resignation addressed to appointing authority/MD preferably by letter thru Registered post (and avoid by posting at some software resignation tool) and mention clearly the notice period tendered by you.......................and date of expiry of notice period i.e.dated......................and obtain POD from PO and also certified copy of run sheet of postman.
If at all you have post at some software resignation tool do that later/after sending Redg. Post and mention that you have have tendred notice of resignation by letter dated...............and notice period is ..................days and LWD is dated..............and download the copy and keep it with you. If it shoes any other date submit protest by letter thry Redg. Post............................and ask to correct the error.
Is it mentioned in any of the clauses of appointment letter/HR policy etc mentioned in appointment letter that notice of resignation can be accepted before expiry of notice period?
You may better show all docs on record to an able Labor Law Cosnultant/Service Matters Lawyer/Law firm and let them draft your communications.