Convert GST (Gulf Standard Time) to IST (Indian Standard Time). IST is currently 1 hour 30 minutes ahead of GST. Add more timezones above or drag the timeline below to find a meeting time that suits everyone.
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Free World Timezone Converter & Meeting Planner
The World Timezone Converteris a free, browser-based world time converter, world clock and meeting planner that lets you compare the current local time across multiple cities and timezones at a glance. Add the timezones of your teammates, clients, or remote offices, and instantly see each location's wall-clock time, UTC offset, day of the week, and a colour-coded 24-hour timeline. Drag the time slider to find a meeting slot that lands inside everyone's working hours — no spreadsheets, no mental math, no signup.
Whether you are coordinating a daily standup between San Francisco and Bengaluru, a sales call spanning London, New York, and Tokyo, or a product launch across global offices, timezone math is error-prone and exhausting. This tool does the conversion for you using the full IANA timezone database built into your browser, so daylight saving time (DST) transitions are handled automatically and every offset is exact for the date you are viewing.
How to Use
Add timezones— click the search box and start typing a city or region name (for example “Tokyo” or “New York”). Select a result to add it as a new row. You can also click one of the popular timezone chips for a one-click add, or load a preset team like “US ↔ India”.
Compare live times— each row shows the city, current local time, date, weekday, and UTC offset, updating every second. A sun or moon icon tells you whether it is day or night in that location.
Find a meeting time— drag the time slider at the top of the timeline. Every row updates to the corresponding local time, and each hour cell is colour-coded: greenfor working hours (9 am–6 pm), amber for early/late hours, and red for night. Pick a moment where all rows are green or amber.
Reorder & label— use the up/down arrows to reorder rows and double-click a label to rename it (for example a teammate's name). Remove a row with the trash button.
Go full screen— click the expand button to present the board during a call, or share your screen. Press Esc to exit.
Features
Multiple timezones at once — add as many cities as you need, dynamically, with no hard limit
Live world clock — every row updates every second so you always see the real current time
Meeting planner timeline — a 24-hour colour-coded strip per timezone with a draggable time slider
Accurate UTC offsets — computed from the IANA timezone database with automatic DST handling
Day / night indicators — sun and moon icons show whether it is daytime in each location
Custom labels — rename any row with a teammate or office name; add duplicates of the same zone
Preset teams — one-click load common cross-timezone team setups
Full-screen mode — present the board during video calls or share your screen
UTC by default — starts with a single UTC row so everyone has a consistent reference point
No persistence — nothing is stored or sent to a server; close the tab and the board resets
Responsive — works on mobile, tablet, and desktop with dark mode support
100% client-side & private — all calculations run in your browser using the native Intl API
Common Use Cases
Scheduling remote standups— find a time that respects working hours for an engineering team split across continents.
Client & sales calls— confirm a polite meeting hour before sending a calendar invite to an overseas customer.
Product launches & webinars— announce an event in multiple local times without converting each one by hand.
On-call & support rotations— see at a glance who is in which timezone when planning a 24/7 coverage rota.
Travel planning— check the local time and day at your destination before booking flights or hotels.
Webinar & livestream scheduling— share one UTC time and let attendees convert it to their own city in seconds.
Convert between specific timezones: UTC to IST, EST to IST, PST to IST
The search box understands conversion-style queries. Type UTC to IST, EST to IST, PST to IST, GMT to IST, or any pair of abbreviations, city names, or countries separated by “to”, “->”, or “vs”. The tool resolves both sides and adds the two timezones to your board in a single click, so you can immediately see the live time and offset difference side by side and slide to find a matching working hour.
Some of the most common conversions people search for, all handled by this tool:
UTC to IST — Coordinated Universal Time to Indian Standard Time (Asia/Kolkata, UTC+5:30)
EST to IST — US Eastern Time (America/New_York) to Indian Standard Time
PST to IST — US Pacific Time (America/Los_Angeles) to Indian Standard Time
GMT to IST — Greenwich Mean Time (Europe/London) to Indian Standard Time
IST to EST — Indian Standard Time to US Eastern Time
PST to EST — US Pacific Time to US Eastern Time
CET to IST — Central European Time (Europe/Paris) to Indian Standard Time
JST to IST — Japan Standard Time (Asia/Tokyo) to Indian Standard Time
Remember that offsets shift with daylight saving time: Eastern Time is UTC-5 in winter (EST) and UTC-4 in summer (EDT), while IST stays a constant UTC+5:30 year-round. Because this tool reads the IANA timezone database for the exact date you are viewing, the converted times are always correct for the day you pick, not a fixed offset.
Timezones, UTC & Daylight Saving Time Explained
The Earth is divided into 24 standard timezones, each nominally 15° of longitude wide and one hour apart from its neighbours. In practice, borders, politics, and history make the map far more irregular — some zones use 30- or 45-minute offsets (such as Asia/Kolkata at UTC+5:30 or Australia/Adelaide at UTC+9:30), and many countries observe daylight saving time, shifting their offset by an hour for part of the year.
Because of this complexity, modern software never stores raw offsets. Instead it stores an IANA timezone identifier (for example America/New_York) and lets the timezone database compute the correct offset for any given instant — including past and future DST changes. This tool uses that same database (via the browser's Intl API), so the offsets you see are always correct for the exact moment being displayed.
UTC(Coordinated Universal Time) is the reference point: it has a fixed offset of zero and never observes DST, which is why this tool opens with a single UTC row by default. To convert any local time to UTC, subtract the zone's offset; to convert UTC to a local time, add the offset. The meeting slider does this conversion for all your rows simultaneously.