What's the current time difference between Kolkata and JST?

Right now, JST (JST · Japan Standard Time) is +3.5h relative to Kolkata (Kolkata). The number is live and reflects the current daylight-saving status of both zones.

Does this converter account for daylight saving time?

Yes. The math is done against IANA's tz database via Intl.DateTimeFormat, so DST shifts in either zone show up immediately at the transition. Around DST boundaries the conversion can move by an hour from one week to the next — this page always reflects the current rule.

Why does the TO column sometimes show "+1d" or "−1d"?

When the Kolkata hour lands on a different calendar day in JST, we flag it so you don't accidentally schedule a meeting on the wrong date. Kolkata 11 PM is often the next day in eastern-hemisphere zones, for example.

How do I schedule a meeting that works for both zones?

Look at the row highlighted lume green — that's the longest contiguous block where both Kolkata and JST are in standard working hours (9 AM–5 PM local). Open the planner from the link above to lock a specific time and share a DST-stable link with the other party.

Kolkata to JST

Kolkata ↔ JST · Japan Standard Time. Right now, JST is +3.5h relative to Kolkata. DST is honored live.

From

Kolkata

—

JST

—

00:00Kolkata hour of day23:30

Live offset

+3.5h

Kolkata (May 24) ↔ JST (May 24)

If Kolkata or JST just shifted for daylight saving, that's already reflected.

Best meeting overlap

9:00 AM – 1:00 PM

Kolkata time. Equivalent JST: 12:30 PM – 4:30 PM

Working hours = 9 AM – 5 PM in each zone.

Hour-by-hour

Kolkata → JST, every hour

Kolkata · May 24JST · May 24

12:00 AM3:30 AM
1:00 AM4:30 AM
2:00 AM5:30 AM
3:00 AM6:30 AM
4:00 AM7:30 AM
5:00 AM8:30 AM
6:00 AM9:30 AM
7:00 AM10:30 AM
8:00 AM11:30 AM
9:00 AM12:30 PM
10:00 AM1:30 PM
11:00 AM2:30 PM
12:00 PM3:30 PM
1:00 PM4:30 PM
2:00 PM5:30 PM
3:00 PM6:30 PM
4:00 PM7:30 PM
5:00 PM8:30 PM
6:00 PM9:30 PM
7:00 PM10:30 PM
8:00 PM11:30 PM
9:00 PM+1d12:30 AM
10:00 PM+1d1:30 AM
11:00 PM+1d2:30 AM

Both zones in working hours±1d = the TO side lands on a different calendar day

FAQ

Kolkata ↔ JST, questions answered

What's the current time difference between Kolkata and JST?: Right now, JST (JST · Japan Standard Time) is +3.5h relative to Kolkata (Kolkata). The number is live and reflects the current daylight-saving status of both zones.
Does this converter account for daylight saving time?: Yes. The math is done against IANA's tz database via Intl.DateTimeFormat, so DST shifts in either zone show up immediately at the transition. Around DST boundaries the conversion can move by an hour from one week to the next — this page always reflects the current rule.
Why does the TO column sometimes show "+1d" or "−1d"?: When the Kolkata hour lands on a different calendar day in JST, we flag it so you don't accidentally schedule a meeting on the wrong date. Kolkata 11 PM is often the next day in eastern-hemisphere zones, for example.
How do I schedule a meeting that works for both zones?: Look at the row highlighted lume green — that's the longest contiguous block where both Kolkata and JST are in standard working hours (9 AM–5 PM local). Open the planner from the link above to lock a specific time and share a DST-stable link with the other party.

Reverse — JST to Kolkata Time in Kolkata Open in planner