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Legal Metrology (Indian Standard Time) Rules, 2026 Notify IST as Single Reference Time
The Union Government has notified the Legal Metrology (Indian Standard Time) Rules, 2026, making Indian Standard Time (IST) the single reference time for official purposes. The Rules mandate IST use for official, legal, and commercial activities, and provide for digital synchronisation and IST dissemination through Indian timing sources.
Legal Metrology (IST) Rules, 2026:
| Dimension | Key Details |
|---|---|
| Digital synchronisation | The Rules provide for accurate and synchronised timestamps in banking, digital payments, telecom, transport, power grids, and computer networks. |
| Indian timing sources | The Rules provide for reduced dependence on foreign satellite-based timing sources. |
| NavIC | NavIC can be used for secure and reliable IST dissemination, and NavIC (Navigation with Indian Constellation) comprises India’s independent regional satellite navigation system developed by ISRO. |
| Transition period | The Rules provide for a 180-day compliance period for government departments, businesses, and institutions. |
| One Nation, One Time Initiative | The initiative is in progress to disseminate accurate IST through Indian institutions and legal metrology laboratories. |
| White Rabbit Technology-based IST dissemination network | The White Rabbit Technology-based IST Dissemination Demonstration Network has been commissioned at RRSL, Bengaluru, and it demonstrates secure transmission of IST between RRSL Bengaluru and NSE Chennai. |
| Institutions involved | Institutions involved comprise National Physical Laboratory (CSIR-NPL), Indian Space Research Organisation (ISRO), Securities and Exchange Board of India (SEBI), National Stock Exchange (NSE), and Bharat Sanchar Nigam Limited (BSNL). |
| Importance of accurate time | Accurate time provides for precise transaction timestamps in banking and digital payments; network synchronisation in telecommunications; coordination of railways and airports in transport; synchronisation of power systems in the power sector; accurate legal and government records in governance; and coordination of time-critical operations in emergency services. |