The short answer
Irish Standard Time is 7 hours ahead of Mountain Daylight Time.
Irish Standard Time☾
1:31:08am
IST · UTC+01:00 · Fri, Sep 25
Mountain Daylight Time☾
6:31:08pm
MDT · UTC-06:00 · Thu, Sep 24
Read across to convert
Irish Standard Time
IST · UTC+01:00
Mountain Daylight Time
MDT · UTC-06:00
Click any row to pin that hour across both zones.
12amFri
5pmThu ·−1d
NOW
1am
6pmThu ·−1d
2am
7pmThu ·−1d
3am
8pmThu ·−1d
4am
9pmThu ·−1d
5am
10pmThu ·−1d
6am
11pmThu ·−1d
7am
12amFri
8am
1am
9am
WORK2am
10am
WORK3am
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 Daylight Time
9am–10am
Popular conversions
Quick reference.
9amIrish Standard Time=2amMountain Daylight Time
12pmIrish Standard Time=5amMountain Daylight Time
3pmIrish Standard Time=8amMountain Daylight Time
5pmIrish Standard Time=10amMountain Daylight Time
9pmIrish Standard Time=2pmMountain Daylight Time
In context
What each side covers.
Irish Standard Time
1:31amIST · UTC+01:00
Cities on this clock
Mountain Daylight Time
6:31pmMDT · UTC-06:00
Cities on this clock
Related converters
Other popular pairs.
Pacific Time
5:31pm
India Standard Time
6:01am
Pacific Time to India12 hours 30 minutes behind
Eastern Daylight Time
8:31pm
Central European Time
2:31am
Eastern Time to Central Europe6 hours behind
India Standard Time
6:01am
Eastern Daylight Time
8:31pm
India to Eastern Time9 hours 30 minutes ahead
British Summer Time
1:31am
India Standard Time
6:01am
London to India4 hours 30 minutes behind
Pacific Daylight Time
5:31pm
Eastern Daylight Time
8:31pm
Pacific to Eastern Time3 hours behind
Central European Time
2:31am
India Standard Time
6:01am
Central Europe to India3 hours 30 minutes behind
Frequently asked
Quick answers about converting between Irish Standard Time and Mountain Daylight Time. Can't find what you need? Email [email protected].
- What is the time difference between Irish Standard Time and Mountain Daylight Time?
- Irish Standard Time is 7 hours ahead of Mountain Daylight 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 9am in Irish Standard Time, what time is it in Mountain Daylight Time?
- 9am in Irish Standard Time is 2am in Mountain Daylight Time. Use the hour-by-hour table above to read any other time across — find the row and read the matching cell in the other column.
- What's the best time for a call between Irish Standard Time and Mountain Daylight Time?
- 4pm–5pm in Irish Standard Time lines up with 9am–10am in Mountain Daylight 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.