New Delhi: Indian Standard Time (IST) will become the common time reference across the country for legal, administrative, commercial and other official purposes from early 2027.
The Department of Consumer Affairs notified the Legal Metrology (Indian Standard Time) Rules, 2026 on August 27, 2026. The Rules will come into force 180 days from the date of their publication in the Official Gazette, the government has said.
The 180-day period will allow government departments, businesses, institutions and other organisations to make the required changes to their systems before the Rules come into force.
With the growing use of digital and technology-based systems, the need for a common time reference has increased. Banking and digital payments, telecommunications, railways, power systems, computer networks and government records depend on accurate time and time stamps.
Differences between time sources can affect the coordination and recording of such activities. The Rules are aimed at ensuring that important systems across the country use accurate and consistent Indian Standard Time.
The common time reference will support accurate time-stamping of banking and digital payment transactions; coordination of railways, airports and other transport systems; reliable operation of telecommunication and internet networks; accurate time-keeping in power systems; maintenance of government and legal records; and coordination of emergency and other time-sensitive services.
“The Government is developing infrastructure to disseminate accurate Indian Standard Time across the country through Indian institutions and Legal Metrology laboratories. The Rules also provide for the use of NavIC, India’s satellite navigation system, and other approved Indian timing sources for reliable and secure time dissemination,” the ministry has said in a statement.
Several systems use foreign satellite-based time sources at the moment. The development of an Indian time dissemination infrastructure will provide additional options for critical systems and reduce dependence on external time sources.
As part of the ‘One Nation, One Time’ initiative, a White Rabbit Technology-based Indian Standard Time Dissemination Demonstration Network was commissioned at the Regional Reference Standard Laboratory (RRSL), Bengaluru, in July 2026.
“The system has demonstrated the dissemination of Indian Standard Time for sectors including banking, telecommunications, power, transportation and digital governance. The Department has also demonstrated secure dissemination of IST between RRSL Bengaluru and NSE Chennai, in collaboration with CSIR-NPL, ISRO, SEBI, NSE, BSNL and other stakeholders,” the ministry has said.
