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India Notifies One Nation, One Time Rules for Infrastructure
India has made Indian Standard Time the official time reference for important systems.
The new rules explain how this time should be created, maintained and shared.
They will begin 180 days after being published officially.
Banks, phone networks, power systems, trains, computers and government services all need accurate time.
Matching their clocks can help these systems work together.
It can also help security teams understand when events happened during a cyberattack.
Five regional laboratories will help distribute reliable time around the country.
Indian Standard Time can be shared through internet networks, satellites and advanced fibre-optic systems.
The government notified the Legal Metrology (Indian Standard Time) Rules, 2026, establishing IST as India’s common legal time reference.
The rules will take effect 180 days after publication in the Official Gazette.
They cover the generation, maintenance, dissemination and use of Indian Standard Time.
Critical sectors including telecommunications, finance, power, transport, data centres and government systems will be able to use a common time reference.
CSIR-NPL, ISRO and the Department of Legal Metrology have established traceable secondary timescales at five regional laboratories.
- Who
- The Government of India, through the Department of Legal Metrology, notified the rules, with technical support from CSIR-NPL, ISRO and related institutions.
- What
- The Legal Metrology (Indian Standard Time) Rules, 2026 establish Indian Standard Time as a common, legally recognised and traceable national time reference.
- Where
- The framework applies across India, supported by regional laboratories in Ahmedabad, Bengaluru, Bhubaneswar, Faridabad and Guwahati.
- When
- The rules were notified in 2026 and will come into force 180 days after publication in the Official Gazette.
- Why
- To support reliable time synchronisation for critical infrastructure, digital services and cybersecurity.
Key facts
- Rules
- Legal Metrology (Indian Standard Time) Rules, 2026
- Effective date
- 180 days after publication in the Official Gazette
- National reference
- Indian Standard Time will serve as the common legal time reference
- Regional laboratories
- Five Regional Reference Standard Laboratories are located in Ahmedabad, Bengaluru, Bhubaneswar, Faridabad and Guwahati
- Technical providers
- CSIR-NPL, ISRO, NIC and the RRSL network support implementation and dissemination
- Dissemination methods
- NTP, PTP, NavIC and tested White Rabbit optical-fibre technology
- Regulatory authority
- The Legal Metrology Department under the Ministry of Consumer Affairs
Sources
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