1 AM EST to MST
1:00 AM EST is 11:00 PM MST (previous day).
1 AM EST in other time zones
Quarter hours: 1 AM, 1:15, 1:30 and 1:45 EST
- 1:00 AM EST = 11:00 PM MST (previous day)
- 1:15 AM EST = 11:15 PM MST (previous day)
- 1:30 AM EST = 11:30 PM MST (previous day)
- 1:45 AM EST = 11:45 PM MST (previous day)
1 AM EST to MST FAQ
What is 1 AM EST in MST?
1:00 AM EST is 11:00 PM MST (previous day).
Is 1 AM EST the same day in MST?
No. 1:00 AM EST is 11:00 PM MST on the previous day.
What is 1:30 AM EST in MST?
1:30 AM EST = 11:30 PM MST (previous day).
Is 1 AM ET the same as 1 AM EST?
ET (Eastern Time) is the year-round name for these clocks, so 1 AM ET means 1 AM EST on today's date. 1:00 AM EST is 11:00 PM MST (previous day).
Related conversions
All EST to MST times
12 AM EST to MST1 AM EST to MST2 AM EST to MST3 AM EST to MST4 AM EST to MST5 AM EST to MST6 AM EST to MST7 AM EST to MST8 AM EST to MST9 AM EST to MST10 AM EST to MST11 AM EST to MST12 PM EST to MST1 PM EST to MST2 PM EST to MST3 PM EST to MST4 PM EST to MST5 PM EST to MST6 PM EST to MST7 PM EST to MST8 PM EST to MST9 PM EST to MST10 PM EST to MST11 PM EST to MST
Convert MST to EST
Convert EST to other time zones
Convert other time zones to MST
Learn more
Updated 6 November 2026. Time zone data: IANA tz database.