The short answer
5am in Irish Standard Time is 10pm in Mountain Standard Time on the previous day.
Irish Standard Time is 7 hours ahead of Mountain Standard Time. It lands deep outside working hours in Mountain Standard Time — see the best time to meet below for a friendlier slot.
Irish Standard Time☀
5am
Mountain Standard Time☾
10pm
previous day
Right now
2:04pmIST · UTC+01:00 · Mon, Jun 22
7:04amMDT · UTC-06:00 · Mon, Jun 22
Read across to convert
Irish Standard Time
IST · UTC+01:00
Mountain Standard Time
MDT · UTC-06:00
Pinned5amIrish Standard Time=10pmMountain Standard Time · Sun (previous day)
12amMon
5pmSun ·−1d
1am
6pmSun ·−1d
2am
7pmSun ·−1d
3am
8pmSun ·−1d
4am
9pmSun ·−1d
PINNED
5am
10pmSun ·−1d
6am
11pmSun ·−1d
7am
12amMon
8am
1am
9am
WORK2am
10am
WORK3am
11am
WORK4am
12pm
WORK5am
1pm
WORK6am
NOW
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 Standard Time
9am–10am
Popular conversions
Quick reference.
9amIrish Standard Time=2amMountain Standard Time
12pmIrish Standard Time=5amMountain Standard Time
3pmIrish Standard Time=8amMountain Standard Time
5pmIrish Standard Time=10amMountain Standard Time
9pmIrish Standard Time=2pmMountain Standard Time
In context
What each side covers.
Irish Standard Time
2:04pmIST · UTC+01:00
Cities on this clock
Mountain Standard Time
7:04amMDT · UTC-06:00
Cities on this clock
Related converters
Other popular pairs.
Pacific Time
6:04am
India Standard Time
6:34pm
Pacific Time to India12 hours 30 minutes behind
Eastern Standard Time
9:04am
Central European Time
3:04pm
Eastern Time to Central Europe6 hours behind
India Standard Time
6:34pm
Eastern Standard Time
9:04am
India to Eastern Time9 hours 30 minutes ahead
Greenwich Mean Time
2:04pm
India Standard Time
6:34pm
London to India4 hours 30 minutes behind
Pacific Standard Time
6:04am
Eastern Standard Time
9:04am
Pacific to Eastern Time3 hours behind
Central European Time
3:04pm
India Standard Time
6:34pm
Central Europe to India3 hours 30 minutes behind
Frequently asked
Quick answers about converting between Irish Standard Time and Mountain Standard Time. Can't find what you need? Email [email protected].
- What is the time difference between Irish Standard Time and Mountain Standard Time?
- Irish Standard Time is 7 hours ahead of Mountain Standard 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 5am in Irish Standard Time, what time is it in Mountain Standard Time?
- 5am in Irish Standard Time is 10pm in Mountain Standard Time on the previous day. It lands deep outside working hours in Mountain Standard 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 Standard Time?
- 4pm–5pm in Irish Standard Time lines up with 9am–10am in Mountain Standard 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.