diff options
| -rw-r--r-- | NEWS | 4 | ||||
| -rw-r--r-- | doc/coreutils.texi | 34 |
2 files changed, 21 insertions, 17 deletions
@@ -20,6 +20,10 @@ GNU coreutils NEWS -*- outline -*- Internet RFC number for email dates (currently RFC 5322). The old option spellings --rfc-2822 and --rfc-822 still work. + date now outputs "-00" for a numeric time zone if the time is UTC + and the time zone abbreviation begins with "-", indicating that the + time zone is indeterminate. + stty now validates arguments before interacting with the device, ensuring there are no side effects to specifying an invalid option. diff --git a/doc/coreutils.texi b/doc/coreutils.texi index aa8f75481..629136b01 100644 --- a/doc/coreutils.texi +++ b/doc/coreutils.texi @@ -7664,7 +7664,7 @@ files; if you want output columns to line up, you may need to insert spaces in one of the two formats. @item full-iso -List timestamps in full using ISO 8601 date, time, and time zone +List timestamps in full using ISO 8601-like date, time, and time zone components with nanosecond precision, e.g., @samp{2002-03-30 23:45:56.477817180 -0700}. This style is equivalent to @samp{+%Y-%m-%d %H:%M:%S.%N %z}. @@ -11645,7 +11645,7 @@ with @command{date}, @var{format}'s interpretation is affected by the @env{LC_TIME} locale category. @item full-iso -List timestamps in full using ISO 8601 date, time, and time zone +List timestamps in full using ISO 8601-like date, time, and time zone components with nanosecond precision, e.g., @samp{2002-03-30 23:45:56.477817180 -0700}. This style is equivalent to @samp{+%Y-%m-%d %H:%M:%S.%N %z}. @@ -15161,26 +15161,26 @@ This may be @samp{60} if leap seconds are supported. @item %X locale's time representation (e.g., @samp{23:13:48}) @item %z -@w{RFC 5322/ISO 8601} style numeric time zone -(e.g., @samp{-0600} or @samp{+0530}), or nothing if no +Four-digit numeric time zone, e.g., @samp{-0600} or @samp{+0530}, or +@samp{-0000} if no time zone is determinable. This value reflects the numeric time zone appropriate for the current time, using the time zone rules specified -by the @env{TZ} environment variable. +by the @env{TZ} environment variable. A time zone is not determinable if +its numeric offset is zero and its abbreviation begins with @samp{-}. The time (and optionally, the time zone rules) can be overridden by the @option{--date} option. @item %:z -@w{RFC 3339/ISO 8601} style numeric time zone with -@samp{:} (e.g., @samp{-06:00} or @samp{+05:30}), or nothing if no time -zone is determinable. +Numeric time zone with @samp{:}, e.g., @samp{-06:00} or +@samp{+05:30}), or @samp{-00:00} if no time zone is determinable. This is a GNU extension. @item %::z Numeric time zone to the nearest second with @samp{:} (e.g., -@samp{-06:00:00} or @samp{+05:30:00}), or nothing if no time zone is +@samp{-06:00:00} or @samp{+05:30:00}), or @samp{-00:00:00} if no time zone is determinable. This is a GNU extension. @item %:::z Numeric time zone with @samp{:} using the minimum necessary precision -(e.g., @samp{-06}, @samp{+05:30}, or @samp{-04:56:02}), or nothing if +(e.g., @samp{-06}, @samp{+05:30}, or @samp{-04:56:02}), or @samp{-00} if no time zone is determinable. This is a GNU extension. @item %Z @@ -15405,7 +15405,7 @@ second (optional) Note, the @option{--date} and @option{--set} options may not be used with an argument in the above format. The @option{--universal} option may be used with such an argument to indicate that the specified date and time are -relative to Coordinated Universal Time rather than to the local time zone. +relative to Universal Time rather than to the local time zone. @node Options for date @@ -15465,7 +15465,7 @@ be considerable. @itemx --iso-8601[=@var{timespec}] @opindex -I[@var{timespec}] @opindex --iso-8601[=@var{timespec}] -Display the date using the ISO 8601 format, @samp{%Y-%m-%d}. +Display the date using an ISO 8601 format, @samp{%Y-%m-%d}. The argument @var{timespec} specifies the number of additional terms of the time to include. It can be one of the following: @@ -15529,9 +15529,8 @@ For compatibility with older versions of @command{date}, @opindex --rfc-3339=@var{timespec} Display the date using a format specified by @uref{https://tools.ietf.org/search/rfc3339, Internet -RFC 3339}. This is a subset of the ISO 8601 -format, except that it also permits applications to use a space rather -than a @samp{T} to separate dates from times. +RFC 3339}. This is like @option{--iso-8601}, except that a space rather +than a @samp{T} separates dates from times. @dateParseNote The argument @var{timespec} specifies how much of the time to include. @@ -15575,9 +15574,10 @@ See also @ref{Setting the time}. @cindex GMT @cindex leap seconds @vindex TZ -Use Coordinated Universal Time (UTC) by operating as if the +@cindex Universal Time +Use Universal Time by operating as if the @env{TZ} environment variable were set to the string @samp{UTC0}. -Coordinated +UTC stands for Coordinated Universal Time, established in 1960. Universal Time is often called ``Greenwich Mean Time'' (GMT) for historical reasons. Typically, systems ignore leap seconds and thus implement an |