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

Right now, GST (GST · Gulf Standard Time) is −1.5h 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 GST, 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 GST 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 GST

Kolkata ↔ GST · Gulf Standard Time. Right now, GST is −1.5h relative to Kolkata. DST is honored live.

From

Kolkata

—

GST

—

00:00Kolkata hour of day23:30

Live offset

−1.5h

Kolkata (May 24) ↔ GST (May 23)

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

Best meeting overlap

11:00 AM – 4:00 PM

Kolkata time. Equivalent GST: 9:30 AM – 2:30 PM

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

Hour-by-hour

Kolkata → GST, every hour

Kolkata · May 24GST · May 23

12:00 AM10:30 PM
1:00 AM11:30 PM
2:00 AM+1d12:30 AM
3:00 AM+1d1:30 AM
4:00 AM+1d2:30 AM
5:00 AM+1d3:30 AM
6:00 AM+1d4:30 AM
7:00 AM+1d5:30 AM
8:00 AM+1d6:30 AM
9:00 AM+1d7:30 AM
10:00 AM+1d8:30 AM
11:00 AM+1d9:30 AM
12:00 PM+1d10:30 AM
1:00 PM+1d11:30 AM
2:00 PM+1d12:30 PM
3:00 PM+1d1:30 PM
4:00 PM+1d2:30 PM
5:00 PM+1d3:30 PM
6:00 PM+1d4:30 PM
7:00 PM+1d5:30 PM
8:00 PM+1d6:30 PM
9:00 PM+1d7:30 PM
10:00 PM+1d8:30 PM
11:00 PM+1d9:30 PM

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

FAQ

Kolkata ↔ GST, questions answered

What's the current time difference between Kolkata and GST?: Right now, GST (GST · Gulf Standard Time) is −1.5h 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 GST, 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 GST 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 — GST to Kolkata Time in Kolkata Open in planner