Time zone

Use this information to understand the time zones that are included with the system and their properties. You can use one of the time zones included with the system or create your own.

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) or not. 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.

You can use one of the IBM-supplied time zones or create your own. If you want to edit one of the supplied time zones, you should create a new time zone based on the existing time zone. This prevents your changes from being lost when installing i5/OS™ in the future. When i5/OS is installed, the system-supplied time zones are overwritten. All IBM-supplied time zone identifiers begin with the character Q and the time zone names are retrieved from the QCPFMSGQ message file. If you create a time zone (new or based on an existing time zone), it is recommended that the time zone identifier does not begin with the character Q. By doing this, 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 i5/OS V5R3 or later. For more information about how the initial value is determined, see Initial time zone setting.

The following table identifies the time zones included with the system:

Time zone object Offset from UTC Message ID2 Standard Time full name (abbreviated name)1 Message ID3 DST full name (abbreviated name)1 DST start DST end
Q0000UTC 0:00 CPX0910 Coordinated Universal Time (UTC) N/A N/A N/A N/A
Q0000GMT 0:00 CPX0911 Greenwich Mean Time (GMT) N/A N/A N/A N/A
Q0000GMT2 +1:00 CPX0911 Greenwich Mean Time (GMT) CPX0912 British Summer Time (BST) Start of changeLast Sunday in March at 2:00 a.m.End of change Last Sunday in October at 2:00 a.m.
Q000GMT3 0:00 CPX0911 Greenwich Mean Time (GMT) CPX0912 British Summer Time (BST) Start of changeLast Sunday in March at 1:00 a.m.End of change Last Sunday in October at 2:00 a.m.
QN0100UTCS -1:00 CPX0913 UTC-01:00 Standard Time (UTC-01:00S) N/A N/A N/A N/A
QN0200UTCS -2:00 CPX0914 UTC-02:00 Standard Time (UTC-02:00S) N/A N/A N/A N/A
QN0300UTCS -3:00 CPX0915 UTC-03:00 Standard Time (UTC-03:00S) N/A N/A N/A N/A
QN0300UTCS2 -3:00 CPX0916 (GMT - 3:00) Brasilia (UTC-03:00S) CPX095D (GMT - 3:00) Brasilia Daylight Saving Time (UTC-03:00D) Start of changeThird Sunday in October at 2:00 a.m.End of change Second Friday in February at 2:00 a.m.
QN0330NST -3:30 CPX0917 Newfoundland Standard Time (NST) CPX0918 Newfoundland Daylight Time (NDT) Start of changeFirst Sunday in April at 2:00 a.m.End of change Last Sunday in October at 2:00 a.m.
QN0330NST2 -3:30 CPX0917 Newfoundland Standard Time (NST) CPX0918 Newfoundland Daylight Time (NDT) Start of changeFirst Sunday in April at 12:01 a.m.End of change Last Sunday in October at 12:01 a.m.
QN0400UTCS -4:00 CPX0919 UTC-04:00 Standard Time (UTC-04:00S) N/A N/A N/A N/A
QN0400AST -4:00 CPX091A Atlantic Standard Time (AST) CPX091B Atlantic Daylight Time (ADT) Start of changeFirst Sunday in April at 2:00 a.m.End of change Last Sunday in October at 2:00 a.m.
QN0400CLT -4:00 CPX095E Chile Time (CLT) CPX095F Chile Summer Time (CLST) Start of changeSecond Saturday in October at 12:00 a.m.End of change Second Saturday in March at 12:00 a.m.
QN0400UTC2 -4:00 CPX091C (GMT - 4:00) Caracas, Pa Paz (UTC-04:00S) N/A N/A N/A N/A
QN0500UTCS -5:00 CPX091D UTC-05:00 Standard Time (UTC-05:00S) N/A N/A N/A N/A
QN0500EST -5:00 CPX091E Eastern Standard Time (EST) CPX091F Eastern Daylight Time (EDT) Start of changeFirst Sunday in April at 2:00 a.m.End of change Last Sunday in October at 2:00 a.m.
QN0500EST2 -5:00 CPX091E Eastern Standard Time (EST) N/A N/A N/A N/A
QN0600UTCS -6:00 CPX0920 UTC-06:00 Standard Time (UTC-06:00S) N/A N/A N/A N/A
QN0600CST -6:00 CPX0921 Central Standard Time (CST) CPX0922 Central Daylight Time (CDT) Start of changeFirst Sunday in April at 2:00 a.m.End of change Last Sunday in October at 2:00 a.m.
QN0600S -6:00 CPX0923 Central Standard Time (S) CPX0924 Daylight Saving Time (DST) Start of changeFirst Sunday in April at 2:00 a.m.End of change Last Sunday in October at 2:00 a.m.
QN0700UTCS -7:00 CPX0925 UTC-07:00 Standard Time (UTC-07:00S) N/A N/A N/A N/A
QN0700MST -7:00 CPX0926 Mountain Standard Time (MST) CPX0927 Mountain Daylight Time (MDT) Start of changeFirst Sunday in April at 2:00 a.m.End of change Last Sunday in October at 2:00 a.m.
QN0700MST2 -7:00 CPX0926 Mountain Standard Time (MST) N/A N/A N/A N/A
QN0700T -7:00 CPX0928 Mountain Standard Time (T) CPX0924 Daylight Saving Time (DST) Start of changeFirst Sunday in April at 2:00 a.m.End of change Last Sunday in October at 2:00 a.m.
QN0800UTCS -8:00 CPX0929 UTC-08:00 Standard Time (UTC-08:00S) N/A N/A N/A N/A
QN0800PST -8:00 CPX092A Pacific Standard Time (PST) CPX092B Pacific Daylight Time (PDT) Start of changeFirst Sunday in April at 2:00 a.m.End of change Last Sunday in October at 2:00 a.m.
QN0800U -8:00 CPX092C Pacific Standard Time (U) CPX0924 Daylight Saving Time (DST) Start of changeFirst Sunday in April at 2:00 a.m.End of change Last Sunday in October at 2:00 a.m.
QN0900UTCS -9:00 CPX092D UTC-09:00 Standard Time (UTC-09:00S) N/A N/A N/A N/A
QN0900AST -9:00 CPX092E Alaska Standard Time (AST) CPX092F Alaska Daylight Time (ADT) Start of changeFirst Sunday in April at 2:00 a.m.End of change Last Sunday in October at 2:00 a.m.
QN1000UTCS -10:00 CPX0930 UTC-10:00 Standard Time (UTC-10:00S) N/A N/A N/A N/A
QN1000HAST -10:00 CPX0931 Hawaii-Aleutian Standard Time (HAST) CPX0932 Hawaii-Aleutian Daylight Time (HADT) Start of changeFirst Sunday in April at 2:00 a.m.End of change Last Sunday in October at 2:00 a.m.
QN1100UTCS -11:00 CPX0933 UTC-11:00 Standard Time (UTC-11:00S) N/A N/A N/A N/A
QN1200UTCS -12:00 CPX0934 UTC-12:00 Standard Time (UTC-12:00S) N/A N/A N/A N/A
QP1245UTCS +12:45 CPX0935 Chatham Islands Standard Time (UTC+12:45S) CPX0936 Chatham Islands Daylight Time (UTC+12:45D) Start of changeFirst Sunday in October at 2:00 a.m.End of change Third Sunday in March at 2:00 a.m.
QP1245UTC2 +12:45 CPX0935 Chatham Islands Standard Time (UTC+12:45S) CPX0936 Chatham Islands Daylight Time (UTC+12:45D) Start of changeFirst Sunday in October at 2:45 a.m.End of change Third Sunday in March at 03:45 a.m.
QP1200UTCS +12:00 CPX0937 UTC+12:00 Standard Time (UTC+12:00S) N/A N/A N/A N/A
QP1200NZST +12:00 CPX0938 New Zealand Standard Time (NZST) CPX0939 New Zealand Daylight Time (NZDT) Start of changeFirst Sunday in October at 2:00 a.m.End of change Third Sunday in March at 2:00 a.m.
QP1200NZS2 +12:00 CPX0938 New Zealand Standard Time (NZST) CPX0939 New Zealand Daylight Time (NZDT) Start of changeFirst Sunday in October at 2:00 a.m.End of change Third Sunday in March at 3:00 a.m.
QP1100UTCS +11:00 CPX093A UTC+11:00 Standard Time (UTC+11:00S) N/A N/A N/A N/A
QP1000UTCS +10:00 CPX093B UTC+10:00 Standard Time (UTC+10:00S) N/A N/A N/A N/A
QP1000AEST +10:00 CPX093C Australian Eastern Standard Time (AEST) CPX093D Australian Eastern Daylight Saving Time (AEDT) Start of changeLast Sunday in October at 2:00 a.m.End of change Last Sunday in March at 2:00 a.m.
QP1000AES2 +10:00 CPX093C Australian Eastern Standard Time (AEST) CPX093D Australian Eastern Daylight Saving Time (AEDT) Start of changeLast Sunday in October at 2:00 a.m.End of change Last Sunday in March at 3:00 a.m.
QP0930ACST +9:30 CPX093E Australian Central Standard Time (ACST) CPX093F Australian Central Daylight Saving Time (ACDT) Start of changeLast Sunday in October at 2:00 a.m.End of change Last Sunday in March at 2:00 a.m.
QP0930ACS2 +9:30 CPX093E Australian Central Standard Time (ACST) CPX093F Australian Central Daylight Saving Time (ACDT Start of changeLast Sunday in October at 2:00 a.m.End of change Last Sunday in March at 3:00 a.m.
QP0900UTCS +9:00 CPX0940 UTC+09:00 Standard Time (UTC+09:00S) N/A N/A N/A N/A
QP0900JST +9:00 CPX0941 Japan Standard Time (JST) N/A N/A N/A N/A
QP0900KST +9:00 CPX0942 Korea Standard Time (KST) N/A N/A N/A N/A
QP0900WIT +9:00 CPX0943 Waktu Indonesia Timur (WIT) N/A N/A N/A N/A
QP0800UTCS +8:00 CPX0944 UTC+08:00 Standard Time (UTC+08:00S) N/A N/A N/A N/A
QP0800AWST +8:00 CPX0945 Australian Western Standard Time (AWST) N/A N/A N/A N/A
QP0800BST +8:00 CPX0946 Beijing Standard Time (BST) N/A N/A N/A N/A
QP0800JIST +8:00 CPX0947 Jung Yuan Standard Time (JIST) N/A N/A N/A N/A
QP0800WITA +8:00 CPX0948 Waktu Indonesia Tengah (WITA) N/A N/A N/A N/A
QP0700UTCS +7:00 CPX0949 UTC+07:00 Standard Time (UTC+07:00S) N/A N/A N/A N/A
QP0700WIB +7:00 CPX094A Waktu Indonesia Barat (WIB) N/A N/A N/A N/A
QP0600UTCS +6:00 CPX094B UTC+06:00 Standard Time (UTC+06:00S) N/A N/A N/A N/A
QP0600UTC2 +6:00 CPX094C Asia/Almaty (UTC+06:00S) CPX094D Asia/Almaty Daylight Saving Time (UTC+06:00D) Start of changeLast Sunday in March at 2:00 a.m.End of change Last Sunday in September at 2:00 a.m.
QP0600UTC3 +6:00 CPX094C Asia/Almaty (UTC+06:00S) CPX094D Asia/Almaty Daylight Saving Time (UTC+06:00D) Start of changeLast Sunday in March at 2:00 a.m.End of change Last Sunday in October at 3:00 a.m.
QP0530IST +5:30 CPX094E Indian Standard Time (IST) N/A N/A N/A N/A
QP0500UTCS +5:00 CPX094F UTC+05:00 Standard Time (UTC+05:00S) N/A N/A N/A N/A
QP0500UTC2 +5:00 CPX0950 Asia/Aqtobe (UTC+05:00S) CPX0951 Asia/Aqtobe Daylight Saving Time (UTC+05:00D) Start of changeLast Sunday in March at 2:00 a.m.End of change Last Sunday in September at 2:00 a.m.
QP0500UTC3 +5:00 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 CPX0952 UTC+04:00 Standard Time (UTC+04:00S) N/A N/A N/A N/A
QP0400UTC2 +4:00 CPX0953 Asia/Aqtau (UTC+04:00S) CPX0954 Asia/Aqtau Daylight Saving Time (UTC+04:00D) Start of changeLast Sunday in March at 2:00 a.m.End of change Last Sunday in October at 2:00 a.m.
QP0400UTC3 +4:00 CPX0953 Asia/Aqtau (UTC+04:00S) CPX0954 Asia/Aqtau Daylight Saving Time (UTC+04:00D) Start of changeLast Sunday in March at 2:00 a.m.End of change Last Sunday in October at 3:00 a.m.
QP0300MSK +3:00 CPX0961 Moscow Time (MSK) CPX0962 Moscow Summer Time (MSD) Start of changeLast Sunday in March at 2:00 a.m.End of change Last Sunday in October at 3:0 a.m.
QP0300UTCS +3:00 CPX0955 UTC+03:00 Standard Time (UTC+03:00S) N/A N/A N/A N/A
QP0200UTCS +2:00 CPX0956 UTC+02:00 Standard Time (UTC+02:00S) N/A N/A N/A N/A
QP0200EET +2:00 CPX0957 Eastern European Time (EET) CPX0958 Eastern European Daylight Saving Time (EEDST) Start of changeLast Sunday in March at 2:00 a.m.End of change Last Sunday in September at 2:00 a.m.
QP0200EET2 +2:00 CPX0957 Eastern European Time (EET) N/A N/A N/A N/A
QP0200EET3 +2:00 CPX0957 Eastern European Time (EET) CPX0958 Eastern European Daylight Saving Time (EEDST) Start of changeLast Sunday in March at 3:00 a.m.End of change Last Sunday in October at 4:00 a.m.
QP0200SAST +2:00 CPX0959 South African Standard Time (SAST) N/A N/A N/A N/A
QP0100UTCS +1:00 CPX095A UTC+01:00 Standard Time (UTC+01:00S) N/A N/A N/A N/A
QP0100CET +1:00 CPX095B Central European Time (CET) CPX095C Central European Daylight Saving Time (CEST) Start of changeLast Sunday in March at 2:00 a.m.End of change Last Sunday in September at 2:00 a.m.
QP0100CET2 +1:00 CPX095B Central European Time (CET) CPX095C Central European Daylight Saving Time (CEST) Start of changeLast Sunday in March at 2:00 a.m.End of change Last Sunday in October at 2:00 a.m.
QP0100CET3 +1:00 CPX095B Central European Time (CET) CPX095C Central European Daylight Saving Time (CEST) Start of changeLast Monday in March at 2:00 a.m.End of change Last Sunday in September at 2:00 a.m.
QP0100CET4 +1:00 CPX095B Central European Time (CET) CPX095C Central European Daylight Saving Time (CEST) Start of changeLast Sunday in March at 2:00 a.m.End of change Last Sunday in October at 3:00 a.m.
Notes: Start of change
1
The abbreviated and full names of the time zone are specified in messages to allow for translation.
2
The Standard Time names of the time zone are retrieved from the message ID specified. The message ID is located in the QCPFMSG message file. The name is specified in the second-level text of the message ID.
3
The Daylight Saving Time names of the time zone are retrieved from the message ID specified. The message ID is located in the QCPFMSG message file. The name is specified in the second-level text of the message ID.
N/A
Not applicable.
End of change
Parent topic: Concepts
Related concepts
Time
Scenario: Change DST start or end due to time-sensitive programs
Related tasks
Set the time zone before upgrading
Set the time zone after an IPL
Create a time zone
Edit a time zone
Delete a time zone
Related reference
Time zone (QTIMZON) system value