HST to MSK Time Converter
MSK is 13 hours ahead of HST. HST is UTC-10:00, and MSK is UTC+3:00.
Best Time to Call Between HST and MSK
Standard 9-to-5 hours in these two zones never overlap, so someone has to take the call outside their working day. The most workable window is 6:00 PM to 10:00 PM HST, which is 7:00 AM to 11:00 AM MSK.
both at work HST only MSK only neither — hours along the strip are HST.
Common Times Converted
HST on the left, MSK on the right.
HST to MSK: Full 24-Hour Conversion Table
Shaded rows are working hours; the darker shade marks the hours when both zones are at work.
| HST | MSK | Working hours |
|---|---|---|
| 12:00 AM | 1:00 PM | MSK only |
| 1:00 AM | 2:00 PM | MSK only |
| 2:00 AM | 3:00 PM | MSK only |
| 3:00 AM | 4:00 PM | MSK only |
| 4:00 AM | 5:00 PM | — |
| 5:00 AM | 6:00 PM | — |
| 6:00 AM | 7:00 PM | — |
| 7:00 AM | 8:00 PM | — |
| 8:00 AM | 9:00 PM | — |
| 9:00 AM | 10:00 PM | HST only |
| 10:00 AM | 11:00 PM | HST only |
| 11:00 AM | 12:00 AM next day | HST only |
| 12:00 PM | 1:00 AM next day | HST only |
| 1:00 PM | 2:00 AM next day | HST only |
| 2:00 PM | 3:00 AM next day | HST only |
| 3:00 PM | 4:00 AM next day | HST only |
| 4:00 PM | 5:00 AM next day | HST only |
| 5:00 PM | 6:00 AM next day | — |
| 6:00 PM | 7:00 AM next day | — |
| 7:00 PM | 8:00 AM next day | — |
| 8:00 PM | 9:00 AM next day | MSK only |
| 9:00 PM | 10:00 AM next day | MSK only |
| 10:00 PM | 11:00 AM next day | MSK only |
| 11:00 PM | 12:00 PM next day | MSK only |
What HST and MSK Actually Are
HST — Hawaii Standard Time
Honolulu and the rest of Hawaii. Standing at UTC-10:00 as written, and the region does not change its clocks, so that offset holds all year. Hawaii does not observe daylight saving, so this offset holds all year.
Hawaii dropped daylight saving in 1967 and never resumed it. Being close to the equator, its daylight barely varies across the year, so there is little to gain.
MSK — Moscow Time
Moscow, Saint Petersburg, Minsk. Standing at UTC+3:00 as written, and the region does not change its clocks, so that offset holds all year. Russia abolished daylight saving in 2014, so Moscow stays on UTC+3 all year.
Russia scrapped daylight saving in 2011 by staying permanently on summer time, found the dark winter mornings unpopular, and settled on permanent standard time in 2014.
What This Means in Practice
The date changes mid-working-day
For 6 of the eight hours in a normal HST working day, the equivalent MSK time falls on a different calendar date. Anything scheduled in that stretch needs the date checked as well as the time, or a Tuesday call quietly becomes a Wednesday one at the other end.
A gap you can rely on
Neither region changes its clocks, so this difference holds every day of the year. A recurring meeting booked once stays correct — worth knowing, because most cross-border pairs cannot say that.
Nearly opposite sides of the clock
At 13 hours apart, one side's morning is the other side's night. Handing work over at the end of a shift usually beats trying to get both parties in the same call.
Major Cities in Each Zone
Cities on HST
Cities on MSK
Frequently Asked Questions
What is the time difference between HST and MSK?
MSK is 13 hours ahead of HST.
What is 9:00 AM HST in MSK?
9:00 AM HST is 10:00 PM MSK.
What are the best hours to schedule a call between HST and MSK?
Standard business hours in these two zones do not overlap at all, so one side has to work outside the 9-to-5. The most workable window is 6:00 PM to 10:00 PM HST, which is 7:00 AM to 11:00 AM MSK.
Does the difference between HST and MSK change during the year?
No. Neither region changes its clocks, so this gap is fixed all year round.
Does HST always mean Hawaii Standard Time?
Hawaii does not observe daylight saving, so this offset holds all year.
Does MSK always mean Moscow Time?
Russia abolished daylight saving in 2014, so Moscow stays on UTC+3 all year.