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Time Zone Converter
This time zone converter turns a date and time in one zone into the matching date and time in another, so you can schedule a call, catch a flight, or message a friend without doing the maths in your head. Pick any two zones from the full list, or use the quick presets for the most common pairs: EST to IST and EST to PST. Because it uses your browser's own time-zone data, daylight saving is handled for you — the offset shown is the one that actually applies on the date you picked.
Offsets change with daylight saving, so always check the date you picked — the same two zones can be an hour closer or further apart in summer than in winter.
How it works
A time zone converter answers one simple question: when it is a certain time where I am, what time is it where they are? The world is divided into zones, each offset from Coordinated Universal Time (UTC) by a set number of hours — Eastern Time is UTC−5 in winter, India Time is UTC+5:30 all year, and Japan Time is UTC+9. The converter takes your date and time, works out the exact instant it represents, and then reads that instant back on the clock of the zone you are converting to.
The tricky part is daylight saving time (DST). Much of the United States moves its clocks forward one hour on the second Sunday in March and back on the first Sunday in November, so Eastern Time is UTC−5 in January (EST) but UTC−4 in July (EDT), and Pacific Time is UTC−8 in January (PST) but UTC−7 in July (PDT). India, Japan, and China do not observe daylight saving at all, so the gap between New York and Mumbai is 10 hours 30 minutes in winter but 9 hours 30 minutes in summer. This converter uses your browser's built-in time-zone database, which knows the rules for every date, so you do not have to remember any of that — just pick the right date and the offset shown will be the one that applies on that day.
Two pairs deserve a special mention because they are the ones people search for most. EST to IST is the New York–India link: 10:00 AM in New York in January is 8:30 PM the same day in Mumbai, a gap of 10 hours 30 minutes. EST to PST is the New York–Los Angeles link: 10:00 AM in New York is 7:00 AM the same day in Los Angeles, a gap of 3 hours. The quick preset buttons above set both zones and the direction in one tap, and you can still change the date and time after pressing them.
Worked example
You are in New York and need to call a colleague in Mumbai on Thursday, January 15, 2026 at 10:00 AM your time. What time is it for them?
Step 1: Set the From zone to Eastern (EST/EDT) and the To zone to India (IST).
Step 2: Enter the date 2026-01-15 and the time 10:00.
Step 3: The converter notes that in January, Eastern Time is UTC−5 and India Time is UTC+5:30, a gap of 10 hours 30 minutes.
Step 4: Add 10 hours 30 minutes to 10:00 AM, which gives 8:30 PM the same day.
The tool gives exactly this result: 8:30 PM IST on Thursday, January 15, 2026. The EST → PST preset gives the same kind of answer for Los Angeles: 10:00 AM Eastern on January 15 is 7:00 AM PST the same day.
FAQ
How many hours is EST ahead of or behind IST?
Eastern Time is 10 hours 30 minutes behind India Time in winter, when Eastern is on standard time (UTC−5) and India is at UTC+5:30. So 10:00 AM EST is 8:30 PM IST the same day. In summer, Eastern moves to daylight time (UTC−4) and the gap shrinks to 9 hours 30 minutes, so 10:00 AM EDT is 7:30 PM IST.
What is the time difference between EST and PST?
Eastern and Pacific Time are 3 hours apart all year: 10:00 AM Eastern is 7:00 AM Pacific. Both zones observe daylight saving on the same dates, so the gap stays at 3 hours in summer too — 10:00 AM EDT is 7:00 AM PDT. The date is the same on both sides unless you are converting a time after 9:00 PM Eastern, which lands after midnight in the Pacific.
Does this converter handle daylight saving time?
Yes. It uses your browser's time-zone database, which knows each zone's daylight saving rules for the date you picked. The offset shown is the one that applies on that date, not a fixed number. Just make sure the date is right — converting a July meeting with a January date would give an answer an hour off for zones that observe daylight saving.
Why does the date sometimes change when I convert time?
Because the gap between zones can be large. Mumbai is 10 hours 30 minutes ahead of New York, so 9:00 PM on Monday in New York is 7:30 AM on Tuesday in Mumbai. Sydney is even further ahead — up to 16 hours — so an evening in the United States is already the next afternoon there. The converter always shows the full date on both sides so the change is never a surprise.
What is the difference between EST and EDT, and PST and PDT?
EST (UTC−5) is Eastern Standard Time, used in winter; EDT (UTC−4) is Eastern Daylight Time, used from the second Sunday in March to the first Sunday in November. The same split applies on the West Coast: PST (UTC−8) in winter and PDT (UTC−7) in summer. When people say EST loosely, they usually mean Eastern Time in general — this converter shows the right abbreviation for the date you picked.