Centre notifies rules mandating IST as single common time reference
The government has notified the Legal Metrology (Indian Standard Time) Rules, 2026, mandating Indian Standard Time (IST) as the single reference for legal, administrative, commercial and other official purposes across the country.
The nodal consumer affairs ministry notified the rules on August 27 but they will come into force 180 days after their publication in the official gazette, giving government departments, businesses, and institutions time to align their systems.
The move comes amid growing reliance on digital and technology-based systems -- from banking and payments to telecommunications, railways, power grids and computer networks -- that depend on accurate and synchronised time stamps.
The ministry said inconsistencies between different time sources currently in use could affect the coordination and recording of such activities, prompting the push for a uniform national time standard.
The common time reference is expected to support accurate time-stamping of banking and
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