TZDBK | Back to Index page

| Prolog Control Block Contents TZDBK DSECT Storage Layout Cross Reference (Contains links to field and bit definitions) |
Programming Interface Information: This information is NOT intended to be used as Programming Interfaces of z/VM.

TZDBK Prolog | Top of page

     NAME       : HCPTZDBK
     DESCRIPTION: Time Zone Definition Block
     DSECT      : TZDBK
     FUNCTION   : This DSECT maps the definitions of local time
                  zones based on each zone's deviation from the
                  standard time at longitude 0.  This standard
                  time is known as Universal Coordinated Time,
                  abbreviation UTC.  This standard was formerly
                  known as Greenwich Mean Time, abbreviation GMT.
     LOCATED BY : PFXSYS -> SYSCM
                  SYSZANCR -> TZABK  (Time Zone Anchor Block)
                  TZATZD -> TZDBK
                  <TZDFWD -> TZDBK, until TZDFWD = 0>
     CREATED BY : HCPTZNAD
     DELETED BY : None

TZDBK Control Block Content | Top of page

     TZDBK DSECT
    Top of page

    Hex   Dec Type/Val   Lng Label (dup)    Comments
    ---- ---- --------- ---- -------------- --------
    0000    0 Structure      TZDBK          Time Zone Definition Block
    0000    0 Address      4 TZDFWD         Forward pointer
    0004    4 Signed       4 TZDZONE        +/- seconds adjustment
    0008    8 Character    4 TZDZNID        Time zone id
              0000000C       TZDSIZE        *-TZDBK Length of 1 entry
              00000002       TZDSIZD        (*-TZDBK+7)/8 Length in Double
                                            words

TZDBK Storage Layout | Top of page

    *** TZDBK - Time Zone Definition Block
    *
    *     +---------------------------+---------------------------+
    *   0 |          TZDFWD           |         TZDZONE           |
    *     +---------------------------+---------------------------+
    *   8 |         TZDZNID           | C
    *     +---------------------------+
    *
    *** TZDBK - Time Zone Definition Block

TZDBK Cross Reference | Top of page

    Symbol         Dspl Value
    -------------- ---- -----
    TZDFWD         0000
    TZDSIZD        0008 00000002
    TZDSIZE        0008 0000000C
    TZDZNID        0008
    TZDZONE        0004

This information is based on z/VM 7.2.0 Last updated on 24 Jun 2020 at 09:31:27 EDT.
Copyright IBM Corporation, 1990, 2020