India adding Bagan(Tea-Garden) Timing along with IST for day light saving
Assam government has decided to switch to Bagaan (tea garden) Time, an hour ahead of Indian Standard Time (IST) declared on last Wednesday 02 2014.
Earlier before 1947 India had two time zones. In the East, Calcutta Time was 5:30:21 hours ahead of GMT, while Bombay Time in the West was 4:51:00 hours ahead of GMT. Calcutta Time was abandoned in 1948 and Bombay Time in 1955.
Bagan (Tea-Graden) Time: The term Bagaan Time in Assam reflects labour laws, such as the Plantations Labour Act of 1951, which allow governments to set local times for particular areas. Tea gardens in Assam already work to local clocks set an hour in advance of IST.
IST—set five-and-a-half hours ahead of the international Greenwich Mean Time (GMT) and introduced in 1947—has been chosen with reference to a central station sited 82º 30’ longitude east and 23º 11’ latitude North, passing through Allahabad district in Uttar Pradesh