CAST to CHOST Converter

Updating current time…
CAST
Casey Time
UTC+8
12am
3am
6am
9am
12pm
3pm
6pm
9pm
CHOST
Choibalsan Summer Time
UTC+9
1h ahead
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

8:00 pm20:00 CAST (UTC+8), Oct 27, 2026 = 9:00 pm21:00 CHOST (UTC+9), Oct 27, 2026

CAST is 1 hour behind CHOST.

CAST and CHOST examples

These examples always use CAST (UTC+8) 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.

CAST is 1 hour behind CHOST.

How the time difference changes

CAST is 1 hour behind CHOST year-round.

Working hours of 9:00 am to 6:00 pm in CAST correspond to 10:00 am to 7:00 pm in CHOST.Working hours of 09:00 to 18:00 in CAST correspond to 10:00 to 19:00 in CHOST.

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

Time Difference

Casey Time is 1 hour behind Choibalsan Summer Time.
8:00 pm20:00 in CAST is 9:00 pm21:00 in CHOST

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

8:00 pm20:00 Casey Time (CAST). Offset UTC +8:00 hours
9:00 pm21:00 Choibalsan Summer Time (CHOST). Offset UTC +9:00 hours

8:00 pm20:00 CAST / 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
CASTCHOST
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Casey Time

Offset: CAST is 8 hours ahead of Greenwich Mean Time (GMT).

Countries using this time zone: Antarctica

Daylight Saving: Clocks in Casey Time (CAST) do not change for daylight saving time, so CAST 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 Casey Time (CAST)
CAST all year

Open the world time zone map© OpenStreetMap

CAST representations, usage and related time zones

W3C/ISO-8601: International standard covering representation and exchange of dates and time-related data
  • +08 - basic short
  • +0800 - basic
  • +08:00 - extended
Email/RFC-2822: Internet Message Format Date Standard, typically used for timestamps in email headers
  • +0800 - sign character (+) followed by a four digit time providing hours (08) and minutes (00) of the offset. Indicates an offset of eight hours to the east of the zero meridian.
Military/NATO: Used by the U.S. military, Chinese military and others
  • Hotel - Military abbreviation for CAST
  • H - short form of 'Hotel'
Time zones with the GMT +8 offset:
  • ACT - ASEAN Common Time
  • AWST - Australian Western Standard Time
  • BNT - Brunei Darussalam Time
  • CAST - Casey Time
  • CHOT - Choibalsan Time
  • CST - China Standard Time
  • H - Hotel Time Zone
  • HKT - Hong Kong Time
  • HOVST - Hovd Summer Time
  • IRKT - Irkutsk Time
  • KRAST - Krasnoyarsk Summer Time
  • MYT - Malaysia Time
  • PHT - Philippine Time
  • SGT - Singapore Time
  • ULAT - Ulaanbaatar Time
  • WITA - Central Indonesian 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