Whether an employee has to complete 5 years of service in order to entitled for gratuity?

Whether an employee has to complete 5 years of service in order to entitled for gratuity??
Or 4 years and 5th years 240 days will entitled him to receive gratuity.
Pls explain with notification and case study.
Your discussion / information on this topic will be highly appreciated
31st March 2018 From India, Mumbai

A lot of discussions has happened on the captioned subject. You are requested to use the search option and go through the discussions in detail and get the details that you want to capture. That is called professional approach. I have quoted it because you are heading HR department of a group of companies and you are not expected to get fed by spoon.
31st March 2018 From India, Kannur