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

Right now, MST (MST · Mountain Time) is −10h relative to GST (GST · Gulf Standard Time). 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 GST hour lands on a different calendar day in MST, we flag it so you don't accidentally schedule a meeting on the wrong date. GST 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 GST and MST 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.

GST to MST

GST · Gulf Standard Time ↔ MST · Mountain Time. Right now, MST is −10h relative to GST. DST is honored live.

From

GST

—

MST

—

00:00GST hour of day23:30

Live offset

−10h

GST (May 24) ↔ MST (May 23)

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

Best meeting overlap

No 9-to-5 overlap.

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

Hour-by-hour

GST → MST, every hour

GST · May 24MST · May 23

12:00 AM2:00 PM
1:00 AM3:00 PM
2:00 AM4:00 PM
3:00 AM5:00 PM
4:00 AM6:00 PM
5:00 AM7:00 PM
6:00 AM8:00 PM
7:00 AM9:00 PM
8:00 AM10:00 PM
9:00 AM11:00 PM
10:00 AM+1d12:00 AM
11:00 AM+1d1:00 AM
12:00 PM+1d2:00 AM
1:00 PM+1d3:00 AM
2:00 PM+1d4:00 AM
3:00 PM+1d5:00 AM
4:00 PM+1d6:00 AM
5:00 PM+1d7:00 AM
6:00 PM+1d8:00 AM
7:00 PM+1d9:00 AM
8:00 PM+1d10:00 AM
9:00 PM+1d11:00 AM
10:00 PM+1d12:00 PM
11:00 PM+1d1:00 PM

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

FAQ

GST ↔ MST, questions answered

What's the current time difference between GST and MST?: Right now, MST (MST · Mountain Time) is −10h relative to GST (GST · Gulf Standard Time). 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 GST hour lands on a different calendar day in MST, we flag it so you don't accidentally schedule a meeting on the wrong date. GST 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 GST and MST 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 — MST to GST Open in planner