Compare IST vs GMT
See the current time difference between India Standard Time and Greenwich Mean Time, including DST effects and the best hours to meet.
Current Time Difference
India Standard Time is UTC+5:30 and Greenwich Mean Time is UTC+0, so IST is 5 hours 30 minutes ahead of GMT year-round.
Track DST Effects
India Standard Time does not observe daylight saving time, while GMT remains UTC+0 in winter and may shift to BST in summer for related regions.
Find Best Meeting Times
Use the hour-by-hour comparison grid to spot overlapping work hours, then export meeting times with ICS download, Google Calendar, or Gmail.
IST (India Standard Time, UTC+5:30) is 5 hours 30 minutes ahead of GMT (Greenwich Mean Time, UTC+0), so when it is 9:00 in India, it is 3:30 in Greenwich Mean Time.
Looking for Irish Standard Time? See /time-converter/ist-ireland-time-zone.
Looking for Israel Standard Time? See /time-converter/ist-israel-time-zone.
How to Find the Time Difference Between IST and GMT
Open the IST vs GMT converter: Visit
https://www.xconvert.com/time-converter/ist-vs-gmtto see India Standard Time pre-loaded in the comparison grid, which is useful when you are scheduling a call with a UK client, coordinating offshore development work from India, or lining up support coverage across Europe and South Asia. The page displays a 24-hour timeline with colored slots, making it easy to spot whether your proposed meeting falls in normal work hours, evening, or nighttime.Add GMT locations to compare: Click + Add City and search for places that use Greenwich Mean Time, such as London, Accra, or Reykjavik, depending on whether you are planning UK business calls, West African operations, or travel across the North Atlantic. This is especially helpful for industries like IT services, consulting, shipping, and media, where teams in India often work with partners in the United Kingdom, Ghana, or Iceland.
Drag to select a working window: Click Select, then drag across the India Standard Time row to highlight a range in purple, such as 9:00 to 12:00 IST, which corresponds to 3:30 to 6:30 GMT. You can resize the range with the left and right handles or drag the center to test alternatives, which is practical when deciding whether an India morning standup will still land inside early business hours for a London-based client or operations team.
Export and share the selected time: After selecting a range, use the export options for ICS download, Google Calendar, Gmail, Copy to clipboard, or Share link to send the agreed slot to everyone involved. This is useful when a distributed team in India and GMT-based countries needs one confirmed meeting block that appears correctly in each participant’s local calendar without manual conversion errors.
IST vs GMT Offset Explained
India Standard Time is fixed at UTC+5:30, while Greenwich Mean Time is UTC+0. That means GMT is 5 hours 30 minutes behind India Standard Time, and India Standard Time is 5 hours 30 minutes ahead of GMT. In practical terms, 9:00 IST equals 3:30 GMT, 12:00 IST equals 6:30 GMT, 15:00 IST equals 9:30 GMT, and 18:00 IST equals 12:30 GMT.
India Standard Time does not observe DST, so its offset remains UTC+5:30 throughout the year. Greenwich Mean Time is a standard-time abbreviation, and its DST counterpart is BST, which matters for people scheduling recurring calls with the United Kingdom because the UK does not use GMT all year. If you are arranging long-term meetings between India and UK-based teams, the winter schedule aligns with GMT, while the summer schedule shifts when the UK is on British Summer Time instead of Greenwich Mean Time.
India Standard Time is used in India, one of the world’s largest hubs for software development, business process outsourcing, pharmaceuticals, and back-office operations. Greenwich Mean Time is used across a broad set of countries including the United Kingdom, Ghana, Iceland, Senegal, Sierra Leone, Liberia, Guinea, Guinea-Bissau, Gambia, Burkina Faso, Mali, Mauritania, Togo, Ivory Coast, Sao Tome and Principe, and Saint Helena, among others. That makes IST-to-GMT coordination relevant for technology outsourcing, UK legal and financial services support, aviation planning, and international customer service coverage.
Best Times to Schedule IST and GMT Meetings
India Standard Time works well for overlap with GMT during the Indian afternoon. For example, 15:00 IST is 9:30 GMT, which can be a practical slot for sales calls, project kickoffs, and daily syncs because it lands in the morning for GMT participants while staying inside the regular workday in India.
Early India morning meetings usually translate to very early GMT times. A 9:00 IST meeting is 3:30 GMT, which is usually too early for standard office schedules in the United Kingdom or West Africa, so teams often avoid that slot unless they are handling urgent operations, overnight support, or broadcast schedules.
Late afternoon in India often creates the broadest business overlap. At 18:00 IST, it is 12:30 GMT, which can suit cross-border reviews, finance updates, and handoffs between India-based delivery teams and GMT-based managers before the European lunch period ends. This pattern is common in outsourcing, consulting, and multinational support environments where India handles execution and GMT teams manage client-facing communication.
Countries and Use Cases for IST and GMT
India Standard Time applies across India, so businesses working with Bengaluru, Mumbai, Delhi, Hyderabad, Chennai, Pune, and other Indian commercial centers all operate on the same UTC+5:30 offset. This single national time standard simplifies coordination for software releases, customer support rosters, and vendor management across India’s major IT and services markets.
Greenwich Mean Time is used in countries across Europe, West Africa, and the Atlantic, including the United Kingdom, Ghana, Iceland, Ireland, Senegal, and Liberia. For businesses, that means IST-to-GMT planning often supports UK client meetings, NGO and development work in West Africa, shipping and logistics coordination, and travel itineraries that connect India with London or other GMT-based hubs.
For travelers, the 5 hours 30 minutes gap matters when booking flights, airport pickups, and hotel check-ins. A departure or arrival that looks comfortably timed in India can fall much earlier in GMT, so using the grid helps confirm whether your airport transfer, virtual check-in, or connecting meeting lands during local daytime hours.
Frequently Asked Questions
What is the time difference between India Standard Time and Greenwich Mean Time?
India Standard Time is 5 hours 30 minutes ahead of Greenwich Mean Time. The same relationship can be stated the other way around: Greenwich Mean Time is 5 hours 30 minutes behind India Standard Time. For example, 12:00 IST equals 6:30 GMT, which is a useful benchmark for midday business coordination.
How do I convert IST to GMT quickly?
Use the visual comparison grid to drag across a time block in India Standard Time and read the matching time directly on the GMT row. The examples are straightforward: 9:00 IST equals 3:30 GMT, 15:00 IST equals 9:30 GMT, and 18:00 IST equals 12:30 GMT. This is especially useful for recurring meetings where manual conversion mistakes can lead to missed calls.
Does India Standard Time observe daylight saving time?
India Standard Time does not observe DST, so it stays at UTC+5:30 all year. That consistency makes scheduling easier for teams in India because their local offset does not change seasonally. The main seasonal consideration comes from regions that switch away from standard time during part of the year.
Does GMT change during the year?
Greenwich Mean Time is a standard-time abbreviation, and its DST counterpart is BST. This matters most for users scheduling with the United Kingdom, because a meeting aligned to GMT in winter will not represent the same UK local clock time during the period when the UK is on British Summer Time. If you manage recurring meetings, confirm whether your counterpart is using GMT specifically or UK local time more generally.
Is IST India Standard Time or Irish Standard Time?
On this page, IST means India Standard Time, which is UTC+5:30. IST can also mean Irish Standard Time, which is UTC+1, and that time zone has its own page at /time-converter/ist-ireland-time-zone. If you meant Israel Standard Time, use /time-converter/ist-israel-time-zone instead.
Which countries use GMT?
Greenwich Mean Time is used in Burkina Faso, Gambia, Ghana, Guernsey, Guinea, Guinea-Bissau, Iceland, Ireland, Isle of Man, Ivory Coast, Jersey, Liberia, Mali, Mauritania, Saint Helena, Sao Tome and Principe, Senegal, Sierra Leone, Togo, and the United Kingdom. This broad geographic spread makes GMT relevant for business across Europe and West Africa, as well as for travel and logistics planning involving London and Atlantic routes.
What is a good meeting time for IST and GMT teams?
A practical overlap often appears in the India afternoon, because 15:00 IST equals 9:30 GMT and 18:00 IST equals 12:30 GMT. Those times are typically easier than 9:00 IST, which is only 3:30 GMT and usually too early for normal office hours in GMT-based countries. For remote teams, late India afternoon and GMT morning usually create the most workable balance.