Chaibagaan Time
Chaibagaan time is an unofficial time that is followed in Assam’s tea garden, where the work is dependent on sunlight. ‘Chai’ means tea, and ‘bagan’ means garden.
The IST was introduced on September 1, 1947. It corresponds to the time near Uttar Pradesh’s Mirzapur, with states west of this longitude receiving more daylight than those east of it. It is also ahead of the Coordinated Universal Time (UTC, 0.0.0).
UTC or Greenwich Mean Time is based on the imaginary longitude line running through Greenwich in the UK. Based on Greenwich time standard, through which clocks and time are regulated throughout the world. UCT is within about one second of mean solar time at 0° longitude and not adjusted for daylight saving time.
The necessity of two time zones in India
As per a new study by the CSIR-NPL, if India has two time zones, this will increase the overall productivity of the North-Eastern states and will lead to less power consumption.
The NPT has examined the feasibility of implementing the second time zone for North-Eastern states like Meghalaya, Assam, Nagaland, Arunachal Pradesh, Manipur, Mizoram, Tripura and the Andaman and Nicobar Islands, which will be 6.30 hours ahead of UTC to save daylight. Where other parts of the country follow 5.30 Hours ahead of UTC as usual.
India currently observes a single time zone based on the longitude passing through 82°33′E, which will become IST-I under the new proposal. It will cover the regions between longitudes 68°7′E and 89°52′E.