Government Mandates Indian Standard Time for All Digital and Commercial Systems from March 2027

The central government has notified the Legal Metrology Indian Standard Time Rules 2026 under the One Nation One Time initiative, making the use of Indian Standard Time legally compulsory across India. Starting March 2027, all institutions and companies will be required to align their administrative, commercial, digital, and legal operations exclusively with official Indian Standard Time. The rules will come into force 180 days after their official publication, and non compliance will attract legal penalties under the Legal Metrology Act.

The mandatory shift aims to end India's heavy reliance on foreign time systems like American GPS, which are widely used by internet providers, telecom networks, and digital platforms. Modern digital infrastructure such as stock markets, online payment gateways, 5G services, power grids, and data centres rely on microsecond timing accuracy to authenticate transactions and prevent network failures. Adopting a single national time standard will protect national infrastructure from foreign dependencies, cyber attacks, signal spoofing, and operational confusion.

Under the new framework, the CSIR National Physical Laboratory will continue to maintain India's primary official time, while institutions like ISRO through its NavIC satellite system and Regional Reference Standards Laboratories will distribute it across the country. Entities will not be permitted to display or record any unofficial time reference, except where international time zones are clearly marked or where specialised scientific, navigation, and astronomy applications require separate standards.