MDT to JST Time Converter
Japan Standard Time (JST) is currently 15 hours ahead of Mountain Daylight Time (MDT). MDT is UTC-6 and JST is UTC+9. The table below converts every hour of the day between the two, and the call planner shows where working hours line up.
Best Time for a Call
Both sides are inside 9:00 AM to 5:00 PM office hours between 9:00 AM and 5:00 PM in MDT, which is 9:00 AM to 5:00 PM in JST.
Comparing more than two places? The Overlap Zones tool shows working hours for several cities on one grid.
Hour by Hour: MDT to JST
Rows marked office hours fall between 9:00 AM and 5:00 PM in both places. For a specific date, use the interactive converter.
Does the Difference Change During the Year?
MDT and JST are fixed offsets, so the difference between them never changes.
MDT is UTC-6, the summer counterpart of MST, used from March to November.
JST is UTC+9. Japan has no daylight saving, so this offset never changes.
Frequently Asked Questions
How many hours ahead is JST compared to MDT?
JST is currently 15 hours ahead of MDT. MDT and JST are fixed offsets, so the difference between them never changes.
What time is 9:00 AM in MDT in JST?
9:00 AM in MDT is 12:00 AM in JST on the next day.
What is the best time for a call between MDT and JST?
Both sides are inside 9:00 AM to 5:00 PM office hours between 9:00 AM and 5:00 PM in MDT, which is 9:00 AM to 5:00 PM in JST.