Government wants banks, trains and telecom to follow one clock, mandates IST standard

Indian government has notified new rules to make IST the common time reference for critical systems, including banking, digital payments, railways and telecom networks. Here's what the new rules mean for your everyday life.

In Short

• The rules were notified on 27 August and start after 180 days
• Departments and companies now get time to upgrade systems before compliance
• Banking, telecom, railways, power and records need precise synchronised timestamps

The Indian government wants banks, digital payment platforms, railways, telecom networks and power systems to sync their clocks to the same official time reference. The Centre has now notified about new rules that makes Indian Standard Time (IST) the common reference for legal, administrative, commercial and other official purposes across the country.

The Department of Consumer Affairs notified the Legal Metrology (Indian Standard Time) Rules, 2026 on August 27, according to PTI. The rules will come into force 180 days after their publication in the Official Gazette, giving government departments, businesses and other organisations time to make the necessary changes.

The move is part of the Centre’s ‘One Nation, One Time’ initiative. It will cover systems that rely on accurate time, including banking, digital payments, telecom, transport, power systems, government records and emergency services.

But India already follows IST, so what exactly is changing? The government is not changing the time zone or the time people see on their clocks. Instead, the new rules set a common framework for how critical systems synchronise their clocks with IST.

According to the government, a synchronised time system will help critical services accurately record when an event takes place. A digital payment, for example, needs a precise timestamp, as do railway operations, telecom networks, power systems and government records. Even small differences between the time sources used by these systems can affect how transactions and events are recorded and coordinated.

The government says the common time reference will help with:

• Accurate timestamps for banking and digital payments
• Better coordination across railways, airports and other transport systems
• Reliable timing for telecom and internet networks
• Accurate timekeeping for power systems
• Consistent timestamps for government and legal records
• Better coordination of emergency and other time-sensitive services

The government is also building an Indian infrastructure to distribute accurate IST to critical systems. Under the new rules, NavIC, India’s satellite navigation system, along with other approved Indian timing sources, can be used to provide secure and reliable time.

The change is also aimed at reducing India’s reliance on foreign satellite-based time sources. Several systems currently use these sources to keep their clocks accurate. An Indian time-distribution network would give critical infrastructure a reliable domestic source of time and reduce dependence on external systems.

The government has already started testing the technology needed for this. Under the One Nation, One Time initiative, it commissioned a White Rabbit-based IST dissemination network at the Regional Reference Standard Laboratory (RRSL) in Bengaluru in July 2026. According to the Department of Consumer Affairs, the system has demonstrated IST distribution across banking, telecom, power, transport and digital governance.

For businesses and government departments, the change will not happen immediately. They have 180 days from the publication of the rules in the Official Gazette to review their existing systems and make the necessary technical changes.

For most people, there will be no visible change. Your phone, watch and wall clock will continue to show IST as they do now. The difference will largely happen behind the scenes, as critical systems move towards using the same authoritative Indian time reference.

In short, India is not getting a new time zone. The government is essentially making sure that its most important systems are all working from the same clock.

- Ends