If you are reading rules of LBT, 2010 you will come across many places the word "Appointed day".
So, what does it mean
In simple terms its 1st of April, 2013
Now some explanation of the above answer, before that you need to know what the LBT Rule says about it
Here are the exact words of Rule 2(b)
"Appointed day" means the day as notified by the Government, in the Official Gazette, to be the day from which the levy of local body tax is to commence in the area of a Corporation.
Explanation
Notified day for Thane by the Maharashtra Government is 01-04-2013 in official Gazette
For the notification see : Is LBT Applicable in Thane
So, what does it mean
In simple terms its 1st of April, 2013
Now some explanation of the above answer, before that you need to know what the LBT Rule says about it
Here are the exact words of Rule 2(b)
"Appointed day" means the day as notified by the Government, in the Official Gazette, to be the day from which the levy of local body tax is to commence in the area of a Corporation.
Explanation
Notified day for Thane by the Maharashtra Government is 01-04-2013 in official Gazette
For the notification see : Is LBT Applicable in Thane