ChST to CHOST Converter

Updating current time…
ChST
Chamorro Standard Time
UTC+10
12am
3am
6am
9am
12pm
3pm
6pm
9pm
CHOST
Choibalsan Summer Time
UTC+9
1h behind
12am
3am
6am
9am
12pm
3pm
6pm
9pm
CHOST is not used on this date
This converter keeps CHOST at UTC+9. Choibalsan uses CHOT (UTC+8) on this date. Open the CHOT converter, or choose Baruun Urt for city-specific time.

Quick answers

Selected conversion

10:00 pm22:00 ChST (UTC+10), Nov 3, 2026 = 9:00 pm21:00 CHOST (UTC+9), Nov 3, 2026

ChST is 1 hour ahead of CHOST.

ChST and CHOST examples

These examples always use ChST (UTC+10) and CHOST (UTC+9). They stay the same when you change the date or time above. The selected conversion may differ when daylight saving time applies.

ChST is 1 hour ahead of CHOST.

How the time difference changes

ChST is 1 hour ahead of CHOST year-round.

Working hours of 9:00 am to 6:00 pm in ChST correspond to 8:00 am to 5:00 pm in CHOST.Working hours of 09:00 to 18:00 in ChST correspond to 08:00 to 17:00 in CHOST.

Compare ChST time with CHOST time, including current local time, UTC offsets, time difference, daylight saving changes, working hours, and shareable meeting times.

Time Difference

Chamorro Standard Time is 1 hour ahead of Choibalsan Summer Time.
10:00 pm22:00 in ChST is 9:00 pm21:00 in CHOST

ChST to CHOST call time
Best time for a conference call or a meeting is between 10am-6pm10:00-18:00 in ChST which corresponds to 9am-5pm09:00-17:00 in CHOST

10:00 pm22:00 Chamorro Standard Time (ChST). Offset UTC +10:00 hours
9:00 pm21:00 Choibalsan Summer Time (CHOST). Offset UTC +9:00 hours

10:00 pm22:00 ChST / 9:00 pm21:00 CHOST

Choose an hour to update the converter. Day labels such as “next day” or “+1” are relative to the selected date in the first column. Use Up and Down arrow keys, Home or End to move between hours, then Enter or Space to select.

Hourly time comparison
ChSTCHOST
11:00pm previous day
12:00am
1:00am
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3:00am
4:00am
5:00am
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7:00am
8:00am
9:00am
10:00am
11:00am
12:00pm
1:00pm
2:00pm
3:00pm
4:00pm
5:00pm
6:00pm
7:00pm
8:00pm
9:00pm
10:00pm
23:00 previous day
00:00
01:00
02:00
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06:00
07:00
08:00
09:00
10:00
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22:00

Chamorro Standard Time

Offset: ChST is 10 hours ahead of Greenwich Mean Time (GMT).

Countries using this time zone: Guam, Northern Mariana Islands

Principal Cities: The largest city in the ChST time zone is Saipan in the Northern Mariana Islands, with about 48,220 people. Other major cities in this time zone include Dededo Village, Yigo Village, Tamuning-Tumon-Harmon Village, Mangilao Village.

Daylight Saving: Clocks in Chamorro Standard Time (ChST) do not change for daylight saving time, so ChST stays the same throughout the year. Other time zones may set clocks forward in summer and back in winter; see upcoming clock changes worldwide.

Map of the areas on Chamorro Standard Time (ChST)
ChST all year

Open the world time zone map© OpenStreetMap

ChST representations, usage and related time zones

W3C/ISO-8601: International standard covering representation and exchange of dates and time-related data
  • +10 - basic short
  • +1000 - basic
  • +10:00 - extended
Email/RFC-2822: Internet Message Format Date Standard, typically used for timestamps in email headers
  • +1000 - sign character (+) followed by a four digit time providing hours (10) and minutes (00) of the offset. Indicates an offset of ten hours to the east of the zero meridian.
Military/NATO: Used by the U.S. military, Chinese military and others
  • Kilo - Military abbreviation for ChST
  • K - short form of 'Kilo'
IANA/Olson: Reflects ChST time zone boundaries defined by political bodies, primarily intended for use with computer programs and operating systems
  • Pacific/Guam
  • Pacific/Saipan
Time zones with the GMT +10 offset:
  • AEST - Australian Eastern Standard Time
  • CHUT - Chuuk Time
  • ChST - Chamorro Standard Time
  • K - Kilo Time Zone
  • KDT - Korea Daylight Time
  • PGT - Papua New Guinea Time
  • VLAT - Vladivostok Time
  • YAKST - Yakutsk Summer Time
  • YAPT - Yap Time

Choibalsan Summer Time

Offset: CHOST is 9 hours ahead of Greenwich Mean Time (GMT).

CHOST representations, usage and related time zones

W3C/ISO-8601: International standard covering representation and exchange of dates and time-related data
  • +09 - basic short
  • +0900 - basic
  • +09:00 - extended
Email/RFC-2822: Internet Message Format Date Standard, typically used for timestamps in email headers
  • +0900 - sign character (+) followed by a four digit time providing hours (09) and minutes (00) of the offset. Indicates an offset of nine hours to the east of the zero meridian.
Military/NATO: Used by the U.S. military, Chinese military and others
  • India - Military abbreviation for CHOST
  • I - short form of 'India'
Time zones with the GMT +9 offset:
  • AWDT - Australian Western Daylight Time
  • CHOST - Choibalsan Summer Time
  • I - India Time Zone
  • IRKST - Irkutsk Summer Time
  • JST - Japan Standard Time
  • KST - Korea Standard Time
  • PWT - Palau Time
  • TLT - East Timor Time
  • ULAST - Ulaanbaatar Summer Time
  • WIT - Eastern Indonesian Time
  • YAKT - Yakutsk Time