Info Catalog coreutils: Time of day items coreutils: Date input formats coreutils: Combined date and time of day items

coreutils: Time zone items

 
 29.4 Time zone items
 ====================
 
 A “time zone item” specifies an international time zone, indicated by a
 small set of letters, e.g., ‘UTC’ or ‘Z’ for Coordinated Universal Time.
 Any included periods are ignored.  By following a non-daylight-saving
 time zone by the string ‘DST’ in a separate word (that is, separated by
 some white space), the corresponding daylight saving time zone may be
 specified.  Alternatively, a non-daylight-saving time zone can be
 followed by a time zone correction, to add the two values.  This is
 normally done only for ‘UTC’; for example, ‘UTC+05:30’ is equivalent to
 ‘+05:30’.
 
    Time zone items other than ‘UTC’ and ‘Z’ are obsolescent and are not
 recommended, because they are ambiguous; for example, ‘EST’ has a
 different meaning in Australia than in the United States, and ‘A’ has
 different meaning as a military time zone than as an obsolescent RFC 822
 time zone.  Instead, it’s better to use unambiguous numeric time zone
 corrections like ‘-0500’, as described in the previous section.
 
    If neither a time zone item nor a time zone correction is supplied,
 timestamps are interpreted using the rules of the default time zone
 (⇒Specifying time zone rules).
 

Info Catalog coreutils: Time of day items coreutils: Date input formats coreutils: Combined date and time of day items