The short answer
6am in Irish Standard Time is 11pm in Mountain Time on the previous day.
Irish Standard Time is 7 hours ahead of Mountain Time. It lands deep outside working hours in Mountain Time — see the best time to meet below for a friendlier slot.
Irish Standard Time☀
6am
Mountain Time☾
11pm
previous day
Right now
11:46amIST · UTC+01:00 · Mon, Jun 22
4:46amMDT · UTC-06:00 · Mon, Jun 22
Read across to convert
Irish Standard Time
IST · UTC+01:00
Mountain Time
MDT · UTC-06:00
Pinned6amIrish Standard Time=11pmMountain Time · Sun (previous day)
12amMon
5pmSun ·−1d
1am
6pmSun ·−1d
2am
7pmSun ·−1d
3am
8pmSun ·−1d
4am
9pmSun ·−1d
5am
10pmSun ·−1d
PINNED
6am
11pmSun ·−1d
7am
12amMon
8am
1am
9am
WORK2am
10am
WORK3am
NOW
11am
WORK4am
12pm
WORK5am
1pm
WORK6am
2pm
WORK7am
3pm
WORK8am
4pm
WORK9am
WORK5pm
10am
WORK6pm
11am
WORK7pm
12pm
WORK8pm
1pm
WORK9pm
2pm
WORK10pm
3pm
WORK11pm
4pm
WORKdaylightnightworking hoursoverlap
Best time to meet=
Best for a call
Irish Standard Time
4pm–5pm
Mountain Time
9am–10am
Popular conversions
Quick reference.
9amIrish Standard Time=2amMountain Time
12pmIrish Standard Time=5amMountain Time
3pmIrish Standard Time=8amMountain Time
5pmIrish Standard Time=10amMountain Time
9pmIrish Standard Time=2pmMountain Time
In context
What each side covers.
Irish Standard Time
11:46amIST · UTC+01:00
Cities on this clock
Mountain Time
4:46amMDT · UTC-06:00
Cities on this clock
Related converters
Other popular pairs.
Pacific Time
3:46am
India Standard Time
4:16pm
Pacific Time to India12 hours 30 minutes behind
Eastern Standard Time
6:46am
Central European Time
12:46pm
Eastern Time to Central Europe6 hours behind
India Standard Time
4:16pm
Eastern Standard Time
6:46am
India to Eastern Time9 hours 30 minutes ahead
Greenwich Mean Time
11:46am
India Standard Time
4:16pm
London to India4 hours 30 minutes behind
Pacific Standard Time
3:46am
Eastern Standard Time
6:46am
Pacific to Eastern Time3 hours behind
Central European Time
12:46pm
India Standard Time
4:16pm
Central Europe to India3 hours 30 minutes behind
Frequently asked
Quick answers about converting between Irish Standard Time and Mountain Time. Can't find what you need? Email [email protected].
- What is the time difference between Irish Standard Time and Mountain Time?
- Irish Standard Time is 7 hours ahead of Mountain Time right now. We always show the live, daylight-saving-correct difference, so this figure already accounts for whichever side is observing summer time today.
- When it's 6am in Irish Standard Time, what time is it in Mountain Time?
- 6am in Irish Standard Time is 11pm in Mountain Time on the previous day. It lands deep outside working hours in Mountain Time — see the best time to meet below for a friendlier slot. Use the hour-by-hour table above to read any other time across.
- What's the best time for a call between Irish Standard Time and Mountain Time?
- 4pm–5pm in Irish Standard Time lines up with 9am–10am in Mountain Time — both sides are inside a 9-to-5 working day.
- Does this account for daylight saving time?
- Yes. We track every clock change in both places, so the abbreviations you see — IST and MDT — are the ones actually in effect right now, not a fixed all-year value. When either side changes its clocks, this page updates automatically.
- Why is the date sometimes different on each side?
- When two places are far enough apart, the same moment can fall on different calendar days. That is why some conversions are marked "previous day" or "next day" — it is the same instant in time, read off two clocks that crossed midnight at different points.