The Center has notified the Legal Metrology Rules, 2026 mandating Indian Standard Time to be the single reference for legal, administrative, commercial and other official purposes across the country.
The rules, consumer officers, in an order issued August 27th, said inconsistencies between different time sources currently in use could affect the coordination, recording of such activities, prompting the push for a uniform national time standard.
The move will come into force 180 days after the publication in the official gazette, giving government departments, businesses and institutions time to align their systems.
The move comes amid growing dependence on digital and technology-based systems, from banking and payments to telecommunications, railways and power grids and computer networks that depend on accurate and synchronized timestamps.
A common time reference is expected to support accurate time stamping of banking and digital payments transactions, coordination among railways, airports and other transport systems, reliable functioning of telecommunication and internet networks, precise timekeeping in power systems, upkeep of government and legal records, and coordination of emergency and other critical time-critical services, the ministry said in a statement.
A key feature of the rules is the emphasis on reducing the dependence on the foreign satellite-based time sources, which civil critical systems currently rely on.
The government is building an infrastructure to disseminate accurate IAST through Indian Institute of Legal Metrological Laboratories.
The rules also enable the use of NAVIC, India’s indigenous satellite navigation system, along with the previously approved Indian time and sources external reliable time.
As a part of the One Nation, One Time initiative, the ministry in July 2026 commissioned a wide-area technology-based IST dissemination demonstration network at the Regional Reference State Laboratory in Bengaluru.
The pilot has shown that IST can be disseminated across sectors including banking, telecommunications, power, transportation and digital governance.
The 180-day transition period would allow stakeholders to review existing systems and carry out necessary technical updates and prepare for the full implementation for the rule takes effect.