India’s Department of Consumer Affairs issued new rules mandating Indian Standard Time (IST) as the sole official time reference for all civil, commercial, and legal purposes. The Legal Metrology (Indian Standard Time) Rules, 2026, notified on August 27 and published on August 29, will come into effect 180 days later, in late February 2027. The rules prohibit any entity from using, displaying, or recording time references other than IST.
The rules, issued under Section 52 of the Legal Metrology Act, 2009, specify IST as maintained by the CSIR-National Physical Laboratory (CSIR-NPL), which realizes IST by adding five hours and 30 minutes to Coordinated Universal Time (UTC). The notification’s wording, particularly the term “record,” raises questions about whether storing timestamps in UTC remains permissible, a common practice in databases and networked systems where local time is applied only at display.
This clarification is significant for Indian companies and compliance teams, as it may require extensive changes to IT systems and data storage practices if UTC timestamps must be replaced by IST. The ambiguity in the rules has prompted debate over the scope of the prohibition, with some interpreting it narrowly to apply only to displayed or official time, while others read it as a blanket ban on UTC storage. The new mandate aligns India’s official timekeeping but challenges standard global IT protocols.
The rules come into force 180 days after August 29, 2026, setting the compliance deadline in the last week of February 2027. This timeline gives organizations a defined period to assess and implement necessary changes to align with the IST-only mandate, as outlined in the government notification published on medianama.com.