Time zone
The IBM® i operating system provides many time zones. You can use one of the time zones included with the system, or create your own time zones.
You can specify a time zone for each system in your business environment. The time zone setting specifies the offset from Coordinated Universal Time (UTC) and whether to observe daylight saving time (DST). If you specify to observe DST, the system automatically updates the system time when DST begins and ends. You do not need to manually set the system time when DST begins and ends.
In a time zone description, the Year offset value indicates the difference in years between the current Gregorian year and the current year in the calendar used with the time zone for the system. For systems observing a non-Gregorian calendar, this Year offset value is applied to the UTC year to calculate the local system year. For example, if the time zone description specifies a Year offset value of -57, then the local system year is the current Gregorian year minus 57.
In a time zone description, the Daylight saving time shift value represents the number of minutes that local time moves forward when DST starts, or the number of minutes that local time moves backward when DST ends.
In a time zone description, the Alternate name value specifies the corresponding Olson database entry used by Java™. You can specify a maximum of 128 characters for this value.
Note: The Year offset value, the Daylight saving time shift
value, and the Alternate name value are not supported on systems running IBM i V5R4, or earlier.
You can use one of the IBM-supplied time zones, or create your own time zones. If you want to edit one of the supplied time zones, you need to create a new time zone based on the existing time zone. This prevents your changes from being lost when you install the operating system in the future. When the operating system is installed, the system-supplied time zones are overwritten. All IBM-supplied time zone identifiers begin with the character Q, and the full and abbreviated names of time zones are retrieved from the messages in the QCPFMSG message file. If you create a time zone (whether it is new or based on an existing time zone), the time zone identifier should not begin with the character Q. All time zone identifiers that begin with the character Q are reserved for IBM.
Use the time zone (QTIMZON) system value to specify the time zone for your system to use. To use the time zone system value, you must be using IBM i V5R3, or later.
The following table identifies the time zones included with the system.
| Time zone object | Offset from UTC | Alternate name | Message ID2 | Standard Time full name (abbreviated name)1 | Message ID3 | DST full name (abbreviated name)1 | DST start | DST end |
|---|---|---|---|---|---|---|---|---|
| Q0000UTC | 0:00 | UTC | CPX0910 | Coordinated Universal Time (UTC) | N/A | N/A | N/A | N/A |
| Q0000GMT | 0:00 | GMT | CPX0911 | Greenwich Mean Time (GMT) | N/A | N/A | N/A | N/A |
| Q0000GMT2 | 0:00 | Europe/London | CPX0911 | Greenwich Mean Time (GMT) | CPX0912 | British Summer Time (BST) | Last Sunday in March at 2:00 a.m. | Last Sunday in October at 2:00 a.m. |
| Q000GMT3 | 0:00 | Europe/London | CPX0911 | Greenwich Mean Time (GMT) | CPX0912 | British Summer Time (BST) | Last Sunday in March at 1:00 a.m. | Last Sunday in October at 2:00 a.m. |
| QN0100UTCS | -1:00 | GMT-1 | CPX0913 | UTC-01:00 Standard Time (UTC-01:00S) | N/A | N/A | N/A | N/A |
| QN0200UTCS | -2:00 | GMT-2 | CPX0914 | UTC-02:00 Standard Time (UTC-02:00S) | N/A | N/A | N/A | N/A |
| QN0300UTCS | -3:00 | GMT-3 | CPX0915 | UTC-03:00 Standard Time (UTC-03:00S) | N/A | N/A | N/A | N/A |
| QN0300UTC2 | -3:00 | America/Sao_Paulo | CPX0916 | (GMT - 3:00) Brasilia (UTC-03:00S) | CPX095D | (GMT - 3:00) Brasilia Daylight Saving Time (UTC-03:00D) | Third Saturday in October at 2:00 a.m. | Second Friday in February at 2:00 a.m. |
| QN0330NST | -3:30 | America/St_Johns | CPX0917 | Newfoundland Standard Time (NST) | CPX0918 | Newfoundland Daylight Time (NDT) | First Sunday in April at 2:00 a.m. | Last Sunday in October at 2:00 a.m. |
| QN0330NST2 | -3:30 | America/St_Johns | CPX0917 | Newfoundland Standard Time (NST) | CPX0918 | Newfoundland Daylight Time (NDT) | First Sunday in April at 12:01 a.m. | Last Sunday in October at 12:01 a.m. |
| QN0330NST3 | -3:30 | America/St_Johns | CPX0917 | Newfoundland Standard Time (NST) | CPX0918 | Newfoundland Daylight Time (NDT) | Second Sunday in March at 02:00 a.m. | First Sunday in November at 02:00 a.m. |
| QN0330NST4 | -3:30 | America/St_Johns | CPX0917 | Newfoundland Standard Time (NST) | CPX0918 | Newfoundland Daylight Time (NDT) | Second Sunday in March at 12:01 a.m. | First Sunday in November at 12:01 a.m. |
| QN0400UTCS | -4:00 | GMT-4 | CPX0919 | UTC-04:00 Standard Time (UTC-04:00S) | N/A | N/A | N/A | N/A |
| QN0400AST | -4:00 | Atlantic/Bermuda | CPX091A | Atlantic Standard Time (AST) | CPX091B | Atlantic Daylight Time (ADT) | First Sunday in April at 2:00 a.m. | Last Sunday in October at 2:00 a.m. |
| QN0400AST2 | -4:00 | Atlantic/Bermuda | CPX091A | Atlantic Standard Time (AST) | CPX091B | Atlantic Daylight Time (ADT) | Second Sunday in March at 02:00 a.m. | First Sunday in November at 02:00 a.m. |
| QN0400CLT | -4:00 | America/Santiago | CPX095E | Chile Time (CLT) | CPX095F | Chile Summer Time (CLST) | Second Saturday in October at 12:00 a.m. | Second Saturday in March at 12:00 a.m. |
| QN0400UTC2 | -4:00 | America/Caracas | CPX091C | (GMT - 4:00) Caracas, La Paz (UTC-04:00S) | N/A | N/A | N/A | N/A |
| QN0500UTCS | -5:00 | GMT-5 | CPX091D | UTC-05:00 Standard Time (UTC-05:00S) | N/A | N/A | N/A | N/A |
| QN0500EST | -5:00 | America/New_York | CPX091E | Eastern Standard Time (EST) | CPX091F | Eastern Daylight Time (EDT) | First Sunday in April at 2:00 a.m. | Last Sunday in October at 2:00 a.m. |
| QN0500EST2 | -5:00 | GMT-5 | CPX091E | Eastern Standard Time (EST) | N/A | N/A | N/A | N/A |
| QN0500EST3 | -5:00 | America/New_York | CPX091E | Eastern Standard Time (EST) | CPX091F | Eastern Daylight Time (EDT) | Second Sunday in March at 02:00 a.m. | First Sunday in November at 02:00 a.m. |
| QN0600UTCS | -6:00 | GMT-6 | CPX0920 | UTC-06:00 Standard Time (UTC-06:00S) | N/A | N/A | N/A | N/A |
| QN0600CST | -6:00 | America/Chicago | CPX0921 | Central Standard Time (CST) | CPX0922 | Central Daylight Time (CDT) | First Sunday in April at 2:00 a.m. | Last Sunday in October at 2:00 a.m. |
| QN0600CST2 | -6:00 | America/Chicago | CPX0921 | Central Standard Time (CST) | CPX0922 | Central Daylight Time (CDT) | Second Sunday in March at 02:00 a.m. | First Sunday in November at 02:00 a.m. |
| QN0600CST3 | -6:00 | America/Mexico_City | CPX0921 | Central Standard Time (CST) | CPX0922 | Central Daylight Time (CDT) | First Sunday in April at 2:00 a.m. | Last Sunday in October at 2:00 a.m. |
| QN0600S | -6:00 | America/Chicago | CPX0923 | Central Standard Time (S) | CPX0924 | Daylight Saving Time (DST) | First Sunday in April at 2:00 a.m. | Last Sunday in October at 2:00 a.m. |
| QN0700UTCS | -7:00 | GMT-7 | CPX0925 | UTC-07:00 Standard Time (UTC-07:00S) | N/A | N/A | N/A | N/A |
| QN0700MST | -7:00 | America/Denver | CPX0926 | Mountain Standard Time (MST) | CPX0927 | Mountain Daylight Time (MDT) | First Sunday in April at 2:00 a.m. | Last Sunday in October at 2:00 a.m. |
| QN0700MST2 | -7:00 | America/Phoenix | CPX0926 | Mountain Standard Time (MST) | N/A | N/A | N/A | N/A |
| QN0700MST3 | -7:00 | America/Denver | CPX0926 | Mountain Standard Time (MST) | CPX0927 | Mountain Daylight Time (MDT) | Second Sunday in March at 02:00 a.m. | First Sunday in November at 02:00 a.m. |
| QN0700MST4 | -7:00 | America/Mazatlan | CPX0926 | Mountain Standard Time (MST) | CPX0927 | Mountain Daylight Time (MDT) | First Sunday in April at 2:00 a.m. | Last Sunday in October at 2:00 a.m. |
| QN0700T | -7:00 | America/Denver | CPX0928 | Mountain Standard Time (T) | CPX0924 | Daylight Saving Time (DST) | First Sunday in April at 2:00 a.m. | Last Sunday in October at 2:00 a.m. |
| QN0800UTCS | -8:00 | GMT-8 | CPX0929 | UTC-08:00 Standard Time (UTC-08:00S) | N/A | N/A | N/A | N/A |
| QN0800PST | -8:00 | America/Los_Angeles | CPX092A | Pacific Standard Time (PST) | CPX092B | Pacific Daylight Time (PDT) | First Sunday in April at 2:00 a.m. | Last Sunday in October at 2:00 a.m. |
| QN0800PST2 | -8:00 | America/Los_Angeles | CPX092A | Pacific Standard Time (PST) | CPX092B | Pacific Daylight Time (PDT) | Second Sunday in March at 02:00 a.m. | First Sunday in November at 02:00 a.m. |
| QN0800PST3 | -8:00 | America/Tijuana | CPX092A | Pacific Standard Time (PST) | CPX092B | Pacific Daylight Time (PDT) | First Sunday in April at 2:00 a.m. | Last Sunday in October at 2:00 a.m. |
| QN0800U | -8:00 | America/Los_Angeles | CPX092C | Pacific Standard Time (U) | CPX0924 | Daylight Saving Time (DST) | First Sunday in April at 2:00 a.m. | Last Sunday in October at 2:00 a.m. |
| QN0900UTCS | -9:00 | GMT-9 | CPX092D | UTC-09:00 Standard Time (UTC-09:00S) | N/A | N/A | N/A | N/A |
| QN0900AST | -9:00 | America/Anchorage | CPX092E | Alaska Standard Time (AKST) | CPX092F | Alaska Daylight Time (AKDT) | First Sunday in April at 2:00 a.m. | Last Sunday in October at 2:00 a.m. |
| QN0900AST2 | -9:00 | America/Anchorage | CPX092E | Alaska Standard Time (AKST) | CPX092F | Alaska Daylight Time (AKDT) | Second Sunday in March at 02:00 a.m. | First Sunday in November at 02:00 a.m. |
| QN1000UTCS | -10:00 | GMT-10 | CPX0930 | UTC-10:00 Standard Time (UTC-10:00S) | N/A | N/A | N/A | N/A |
| QN1000HAST | -10:00 | America/Adak | CPX0931 | Hawaii-Aleutian Standard Time (HAST) | CPX0932 | Hawaii-Aleutian Daylight Time (HADT) | First Sunday in April at 2:00 a.m. | Last Sunday in October at 2:00 a.m. |
| QN1000HAS2 | -10:00 | America/Adak | CPX0931 | Hawaii-Aleutian Standard Time (HAST) | CPX0932 | Hawaii-Aleutian Daylight Time (HADT) | Second Sunday in March at 02:00 a.m. | First Sunday in November at 02:00 a.m. |
| QN1000HST | -10:00 | Pacific/Honolulu | CPX0963 | Hawaii Standard Time (HST) | N/A | N/A | N/A | N/A |
| QN1100UTCS | -11:00 | GMT-11 | CPX0933 | UTC-11:00 Standard Time (UTC-11:00S) | N/A | N/A | N/A | N/A |
| QN1200UTCS | -12:00 | GMT-12 | CPX0934 | UTC-12:00 Standard Time (UTC-12:00S) | N/A | N/A | N/A | N/A |
| QP1245UTCS | +12:45 | Pacific/Chatham | CPX0935 | Chatham Islands Standard Time (UTC+12:45S) | CPX0936 | Chatham Islands Daylight Time (UTC+12:45D) | First Sunday in October at 2:00 a.m. | Third Sunday in March at 2:00 a.m. |
| QP1245UTC2 | +12:45 | Pacific/Chatham | CPX0935 | Chatham Islands Standard Time (UTC+12:45S) | CPX0936 | Chatham Islands Daylight Time (UTC+12:45D) | First Sunday in October at 2:45 a.m. | Third Sunday in March at 03:45 a.m. |
| QP1200UTCS | +12:00 | GMT+12 | CPX0937 | UTC+12:00 Standard Time (UTC+12:00S) | N/A | N/A | N/A | N/A |
| QP1200NZST | +12:00 | Pacific/Auckland | CPX0938 | New Zealand Standard Time (NZST) | CPX0939 | New Zealand Daylight Time (NZDT) | First Sunday in October at 2:00 a.m. | Third Sunday in March at 2:00 a.m. |
| QP1200NZS2 | +12:00 | Pacific/Auckland | CPX0938 | New Zealand Standard Time (NZST) | CPX0939 | New Zealand Daylight Time (NZDT) | First Sunday in October at 2:00 a.m. | Third Sunday in March at 3:00 a.m. |
| QP1200NZS3 | +12:00 | Pacific/Auckland | CPX0938 | New Zealand Standard Time (NZST) | CPX0939 | New Zealand Daylight Time (NZDT) | Last Sunday in September at 02:00 a.m. | First Sunday in April at 03:00 a.m. |
| QP1100UTCS | +11:00 | GMT+11 | CPX093A | UTC+11:00 Standard Time (UTC+11:00S) | N/A | N/A | N/A | N/A |
| QP1000UTCS | +10:00 | GMT+10 | CPX093B | UTC+10:00 Standard Time (UTC+10:00S) | N/A | N/A | N/A | N/A |
| QP1000AEST | +10:00 | Australia/Sydney | CPX093C | Australian Eastern Standard Time (AEST) | CPX093D | Australian Eastern Daylight Saving Time (AEDT) | Last Sunday in October at 2:00 a.m. | Last Sunday in March at 2:00 a.m. |
| QP1000AES2 | +10:00 | Australia/Sydney | CPX093C | Australian Eastern Standard Time (AEST) | CPX093D | Australian Eastern Daylight Saving Time (AEDT) | Last Sunday in October at 2:00 a.m. | Last Sunday in March at 3:00 a.m. |
| QP0930ACST | +9:30 | Australia/Adelaide | CPX093E | Australian Central Standard Time (ACST) | CPX093F | Australian Central Daylight Saving Time (ACDT) | Last Sunday in October at 2:00 a.m. | Last Sunday in March at 2:00 a.m. |
| QP0930ACS2 | +9:30 | Australia/Adelaide | CPX093E | Australian Central Standard Time (ACST) | CPX093F | Australian Central Daylight Saving Time (ACDT) | Last Sunday in October at 2:00 a.m. | Last Sunday in March at 3:00 a.m. |
| QP0900UTCS | +9:00 | GMT+9 | CPX0940 | UTC+09:00 Standard Time (UTC+09:00S) | N/A | N/A | N/A | N/A |
| QP0900JST | +9:00 | Asia/Tokyo | CPX0941 | Japan Standard Time (JST) | N/A | N/A | N/A | N/A |
| QP0900KST | +9:00 | Asia/Seoul | CPX0942 | Korea Standard Time (KST) | N/A | N/A | N/A | N/A |
| QP0900WIT | +9:00 | Asia/Jayapura | CPX0943 | Waktu Indonesia Timur (WIT) | N/A | N/A | N/A | N/A |
| QP0800UTCS | +8:00 | GMT+8 | CPX0944 | UTC+08:00 Standard Time (UTC+08:00S) | N/A | N/A | N/A | N/A |
| QP0800AWST | +8:00 | Australia/Perth | CPX0945 | Australian Western Standard Time (AWST) | N/A | N/A | N/A | N/A |
| QP0800AWS2 | +8:00 | Australia/Perth | CPX0945 | Australian Western Standard Time (AWST) | CPX0964 | Australian Western Daylight Saving Time (AWDT) | First Sunday in December at 02:00 a.m. | Last Sunday in March at 03:00 a.m. |
| QP0800AWS3 | +8:00 | Australia/Perth | CPX0945 | Australian Western Standard Time (AWST) | CPX0964 | Australian Western Daylight Saving Time (AWDT) | Last Sunday in October at 02:00 a.m. | Last Sunday in March at 03:00 a.m. |
| QP0800BST | +8:00 | Asia/Shanghai | CPX0946 | Beijing Standard Time (BST) | N/A | N/A | N/A | N/A |
| QP0800JIST | +8:00 | Asia/Hong_Kong | CPX0947 | Jung Yuan Standard Time (JIST) | N/A | N/A | N/A | N/A |
| QP0800WITA | +8:00 | Asia/Ujung_Pandang | CPX0948 | Waktu Indonesia Tengah (WITA) | N/A | N/A | N/A | N/A |
| QP0700UTCS | +7:00 | GMT+7 | CPX0949 | UTC+07:00 Standard Time (UTC+07:00S) | N/A | N/A | N/A | N/A |
| QP0700WIB | +7:00 | Asia/Jakarta | CPX094A | Waktu Indonesia Barat (WIB) | N/A | N/A | N/A | N/A |
| QP0600UTCS | +6:00 | GMT+6 | CPX094B | UTC+06:00 Standard Time (UTC+06:00S) | N/A | N/A | N/A | N/A |
| QP0600UTC2 | +6:00 | Asia/Almaty | CPX094C | Asia/Almaty (UTC+06:00S) | CPX094D | Asia/Almaty Daylight Saving Time (UTC+06:00D) | Last Sunday in March at 2:00 a.m. | Last Sunday in September at 2:00 a.m. |
| QP0600UTC3 | +6:00 | Asia/Almaty | CPX094C | Asia/Almaty (UTC+06:00S) | CPX094D | Asia/Almaty Daylight Saving Time (UTC+06:00D) | Last Sunday in March at 2:00 a.m. | Last Sunday in October at 3:00 a.m. |
| QP0530IST | +5:30 | Asia/Calcutta | CPX094E | Indian Standard Time (IST) | N/A | N/A | N/A | N/A |
| QP0500UTCS | +5:00 | GMT+5 | CPX094F | UTC+05:00 Standard Time (UTC+05:00S) | N/A | N/A | N/A | N/A |
| QP0500UTC2 | +5:00 | Asia/Aqtobe | CPX0950 | Asia/Aqtobe (UTC+05:00S) | CPX0951 | Asia/Aqtobe Daylight Saving Time (UTC+05:00D) | Last Sunday in March at 2:00 a.m. | Last Sunday in September at 2:00 a.m. |
| QP0500UTC3 | +5:00 | Asia/Aqtobe | CPX0950 | Asia/Aqtobe (UTC+05:00S) | CPX0951 | Asia/Aqtobe Daylight Saving Time (UTC+05:00D) | Last Sunday in March at 2:00 a.m. | Last Sunday in October at 3:00 a.m. |
| QP0400UTCS | +4:00 | GMT+4 | CPX0952 | UTC+04:00 Standard Time (UTC+04:00S) | N/A | N/A | N/A | N/A |
| QP0400UTC2 | +4:00 | Asia/Aqtau | CPX0953 | Asia/Aqtau (UTC+04:00S) | CPX0954 | Asia/Aqtau Daylight Saving Time (UTC+04:00D) | Last Sunday in March at 2:00 a.m. | Last Sunday in October at 2:00 a.m. |
| QP0400UTC3 | +4:00 | Asia/Aqtau | CPX0953 | Asia/Aqtau (UTC+04:00S) | CPX0954 | Asia/Aqtau Daylight Saving Time (UTC+04:00D) | Last Sunday in March at 2:00 a.m. | Last Sunday in October at 3:00 a.m. |
| QP0300MSK | +3:00 | Europe/Moscow | CPX0961 | Moscow Time (MSK) | CPX0962 | Moscow Summer Time (MSD) | Last Sunday in March at 2:00 a.m. | Last Sunday in October at 3:0 a.m. |
| QP0300UTCS | +3:00 | GMT+3 | CPX0955 | UTC+03:00 Standard Time (UTC+03:00S) | N/A | N/A | N/A | N/A |
| QP0200UTCS | +2:00 | GMT+2 | CPX0956 | UTC+02:00 Standard Time (UTC+02:00S) | N/A | N/A | N/A | N/A |
| QP0200EET | +2:00 | Europe/Tallinn | CPX0957 | Eastern European Time (EET) | CPX0958 | Eastern European Daylight Saving Time (EEDST) | Last Sunday in March at 2:00 a.m. | Last Sunday in September at 2:00 a.m. |
| QP0200EET2 | +2:00 | GMT+2 | CPX0957 | Eastern European Time (EET) | N/A | N/A | N/A | N/A |
| QP0200EET3 | +2:00 | Europe/Tallinn | CPX0957 | Eastern European Time (EET) | CPX0958 | Eastern European Daylight Saving Time (EEDST) | Last Sunday in March at 3:00 a.m. | Last Sunday in October at 4:00 a.m. |
| QP0200SAST | +2:00 | Africa/Johannesburg | CPX0959 | South African Standard Time (SAST) | N/A | N/A | N/A | N/A |
| QP0100UTCS | +1:00 | GMT+1 | CPX095A | UTC+01:00 Standard Time (UTC+01:00S) | N/A | N/A | N/A | N/A |
| QP0100CET | +1:00 | Europe/Zurich | CPX095B | Central European Time (CET) | CPX095C | Central European Daylight Saving Time (CEST) | Last Sunday in March at 2:00 a.m. | Last Sunday in September at 2:00 a.m. |
| QP0100CET2 | +1:00 | Europe/Zurich | CPX095B | Central European Time (CET) | CPX095C | Central European Daylight Saving Time (CEST) | Last Sunday in March at 2:00 a.m. | Last Sunday in October at 2:00 a.m. |
| QP0100CET3 | +1:00 | Europe/Zurich | CPX095B | Central European Time (CET) | CPX095C | Central European Daylight Saving Time (CEST) | Last Monday in March at 2:00 a.m. | Last Sunday in September at 2:00 a.m. |
| QP0100CET4 | +1:00 | Europe/Zurich | CPX095B | Central European Time (CET) | CPX095C | Central European Daylight Saving Time (CEST) | Last Sunday in March at 2:00 a.m. | Last Sunday in October at 3:00 a.m. |
Notes:
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