date(1): Add ISO 8601 formatting option
The new flag is named '-I'. It is documented in the manual page and covered by basic unit tests.
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@ -32,7 +32,7 @@
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.\" @(#)date.1 8.3 (Berkeley) 4/28/95
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.\" $FreeBSD$
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.\"
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.Dd June 1, 2018
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.Dd August 4, 2018
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.Dt DATE 1
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.Os
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.Sh NAME
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@ -64,6 +64,13 @@
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.Nm
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.Op Fl d Ar dst
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.Op Fl t Ar minutes_west
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.Nm
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.Op Fl jnu
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.Op Fl I Ns Op Ar FMT
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.Op Fl f Ar input_fmt
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.Op Fl r Ar ...
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.Op Fl v Ar ...
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.Op Ar new_date
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.Sh DESCRIPTION
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When invoked without arguments, the
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.Nm
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@ -113,6 +120,33 @@ provided rather than using the default
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format.
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Parsing is done using
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.Xr strptime 3 .
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.It Fl I Ns Op Ar FMT
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Use
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.St -iso8601
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output format.
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.Ar FMT
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may be omitted, in which case the default is
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.Sq date .
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Valid
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.Ar FMT
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values are
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.Sq date ,
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.Sq hours ,
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.Sq minutes ,
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and
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.Sq seconds .
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The date and time is formatted to the specified precision.
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When
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.Ar FMT
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is
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.Sq hours
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(or the more precise
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.Sq minutes
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or
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.Sq seconds ) ,
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the
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.St -iso8601
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format includes the timezone.
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.It Fl j
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Do not try to set the date.
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This allows you to use the
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@ -401,6 +435,14 @@ sets the time to
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.Li "2:32 PM" ,
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without modifying the date.
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.Pp
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The command
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.Pp
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.Dl "TZ=America/Los_Angeles date -Iseconds -r 1533415339"
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.Pp
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will display
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.Pp
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.Dl "2018-08-04T13:42:19-07:00"
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.Pp
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Finally the command:
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.Pp
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.Dl "date -j -f ""%a %b %d %T %Z %Y"" ""`date`"" ""+%s"""
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@ -425,6 +467,19 @@ between
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and
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.Xr timed 8
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fails.
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.Pp
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It is invalid to combine the
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.Fl I
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flag with either
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.Fl R
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or an output format
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.Dq ( + Ns ... )
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operand.
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If this occurs,
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.Nm
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prints:
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.Ql multiple output formats specified
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and exits with an error status.
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.Sh SEE ALSO
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.Xr locale 1 ,
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.Xr gettimeofday 2 ,
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@ -443,12 +498,22 @@ The
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utility is expected to be compatible with
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.St -p1003.2 .
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The
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.Fl d , f , j , n , r , t ,
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.Fl d , f , I , j , n , r , t ,
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and
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.Fl v
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options are all extensions to the standard.
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.Pp
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The format selected by the
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.Fl I
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flag is compatible with
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.St -iso8601 .
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.Sh HISTORY
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A
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.Nm
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command appeared in
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.At v1 .
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.Pp
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The
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.Fl I
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flag was added in
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.Fx 12.0 .
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104
bin/date/date.c
104
bin/date/date.c
@ -51,6 +51,7 @@ __FBSDID("$FreeBSD$");
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#include <ctype.h>
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#include <err.h>
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#include <locale.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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@ -68,10 +69,25 @@ __FBSDID("$FreeBSD$");
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static time_t tval;
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int retval;
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static void setthetime(const char *, const char *, int, int);
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static void badformat(void);
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static void iso8601_usage(const char *);
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static void multipleformats(void);
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static void printdate(const char *);
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static void printisodate(struct tm *);
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static void setthetime(const char *, const char *, int, int);
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static void usage(void);
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static const struct iso8601_fmt {
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const char *refname;
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const char *format_string;
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} iso8601_fmts[] = {
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{ "date", "%Y-%m-%d" },
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{ "hours", "T%H" },
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{ "minutes", ":%M" },
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{ "seconds", ":%S" },
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};
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static const struct iso8601_fmt *iso8601_selected;
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static const char *rfc2822_format = "%a, %d %b %Y %T %z";
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int
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@ -79,7 +95,7 @@ main(int argc, char *argv[])
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{
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struct timezone tz;
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int ch, rflag;
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int jflag, nflag, Rflag;
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bool Iflag, jflag, nflag, Rflag;
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const char *format;
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char buf[1024];
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char *endptr, *fmt;
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@ -89,15 +105,16 @@ main(int argc, char *argv[])
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const struct vary *badv;
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struct tm *lt;
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struct stat sb;
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size_t i;
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v = NULL;
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fmt = NULL;
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(void) setlocale(LC_TIME, "");
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tz.tz_dsttime = tz.tz_minuteswest = 0;
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rflag = 0;
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jflag = nflag = Rflag = 0;
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Iflag = jflag = nflag = Rflag = 0;
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set_timezone = 0;
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while ((ch = getopt(argc, argv, "d:f:jnRr:t:uv:")) != -1)
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while ((ch = getopt(argc, argv, "d:f:I::jnRr:t:uv:")) != -1)
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switch((char)ch) {
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case 'd': /* daylight savings time */
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tz.tz_dsttime = strtol(optarg, &endptr, 10) ? 1 : 0;
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@ -108,6 +125,22 @@ main(int argc, char *argv[])
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case 'f':
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fmt = optarg;
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break;
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case 'I':
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if (Rflag)
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multipleformats();
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Iflag = 1;
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if (optarg == NULL) {
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iso8601_selected = iso8601_fmts;
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break;
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}
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for (i = 0; i < nitems(iso8601_fmts); i++)
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if (strcmp(optarg, iso8601_fmts[i].refname) == 0)
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break;
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if (i == nitems(iso8601_fmts))
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iso8601_usage(optarg);
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iso8601_selected = &iso8601_fmts[i];
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break;
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case 'j':
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jflag = 1; /* don't set time */
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break;
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@ -115,6 +148,8 @@ main(int argc, char *argv[])
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nflag = 1;
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break;
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case 'R': /* RFC 2822 datetime format */
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if (Iflag)
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multipleformats();
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Rflag = 1;
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break;
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case 'r': /* user specified seconds */
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@ -163,6 +198,8 @@ main(int argc, char *argv[])
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/* allow the operands in any order */
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if (*argv && **argv == '+') {
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if (Iflag)
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multipleformats();
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format = *argv + 1;
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++argv;
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}
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@ -173,8 +210,11 @@ main(int argc, char *argv[])
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} else if (fmt != NULL)
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usage();
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if (*argv && **argv == '+')
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if (*argv && **argv == '+') {
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if (Iflag)
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multipleformats();
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format = *argv + 1;
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}
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lt = localtime(&tval);
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if (lt == NULL)
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@ -188,6 +228,9 @@ main(int argc, char *argv[])
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}
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vary_destroy(v);
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if (Iflag)
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printisodate(lt);
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if (format == rfc2822_format)
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/*
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* When using RFC 2822 datetime format, don't honor the
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@ -196,12 +239,40 @@ main(int argc, char *argv[])
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setlocale(LC_TIME, "C");
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(void)strftime(buf, sizeof(buf), format, lt);
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printdate(buf);
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}
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static void
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printdate(const char *buf)
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{
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(void)printf("%s\n", buf);
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if (fflush(stdout))
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err(1, "stdout");
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exit(retval);
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}
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static void
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printisodate(struct tm *lt)
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{
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const struct iso8601_fmt *it;
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char fmtbuf[32], buf[32], tzbuf[8];
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fmtbuf[0] = 0;
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for (it = iso8601_fmts; it <= iso8601_selected; it++)
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strlcat(fmtbuf, it->format_string, sizeof(fmtbuf));
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(void)strftime(buf, sizeof(buf), fmtbuf, lt);
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if (iso8601_selected > iso8601_fmts) {
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(void)strftime(tzbuf, sizeof(tzbuf), "%z", lt);
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memmove(&tzbuf[4], &tzbuf[3], 3);
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tzbuf[3] = ':';
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strlcat(buf, tzbuf, sizeof(buf));
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}
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printdate(buf);
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}
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#define ATOI2(s) ((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0'))
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static void
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@ -326,13 +397,28 @@ badformat(void)
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usage();
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}
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static void
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iso8601_usage(const char *badarg)
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{
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errx(1, "invalid argument '%s' for -I", badarg);
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}
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static void
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multipleformats(void)
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{
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errx(1, "multiple output formats specified");
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}
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static void
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usage(void)
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{
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(void)fprintf(stderr, "%s\n%s\n",
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"usage: date [-jnRu] [-d dst] [-r seconds] [-t west] "
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"[-v[+|-]val[ymwdHMS]] ... ",
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(void)fprintf(stderr, "%s\n%s\n%s\n",
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"usage: date [-jnRu] [-d dst] [-r seconds|file] [-t west] "
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"[-v[+|-]val[ymwdHMS]]",
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" "
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"[-f fmt date | [[[[[cc]yy]mm]dd]HH]MM[.ss]] [+format]");
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"[-I[date | hours | minutes | seconds]]",
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" "
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"[-f fmt date | [[[[[cc]yy]mm]dd]HH]MM[.ss]] [+format]"
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);
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exit(1);
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}
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@ -48,6 +48,55 @@ ${desc}_test_body() {
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atf_add_test_case ${desc}_test
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}
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iso8601_check()
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{
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local arg flags exp_output_1 exp_output_2
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arg="${1}"
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flags="${2}"
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exp_output_1="${3}"
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exp_output_2="${4}"
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atf_check -o "inline:${exp_output_1}\n" \
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date $flags -r ${TEST1} "-I${arg}"
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atf_check -o "inline:${exp_output_2}\n" \
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date $flags -r ${TEST2} "-I${arg}"
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}
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iso8601_string_test()
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{
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local desc arg exp_output_1 exp_output_2 flags
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desc="${1}"
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arg="${2}"
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flags="${3}"
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exp_output_1="${4}"
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exp_output_2="${5}"
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atf_test_case iso8601_${desc}_test
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eval "
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iso8601_${desc}_test_body() {
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iso8601_check '${arg}' '${flags}' '${exp_output_1}' '${exp_output_2}'
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}"
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atf_add_test_case iso8601_${desc}_test
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if [ -z "$flags" ]; then
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atf_test_case iso8601_${desc}_parity
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eval "
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iso8601_${desc}_parity_body() {
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local exp1 exp2
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atf_require_prog gdate
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exp1=\"\$(gdate --date '@${TEST1}' '-I${arg}')\"
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exp2=\"\$(gdate --date '@${TEST2}' '-I${arg}')\"
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iso8601_check '${arg}' '' \"\${exp1}\" \"\${exp2}\"
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}"
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atf_add_test_case iso8601_${desc}_parity
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fi
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}
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atf_init_test_cases()
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{
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format_string_test A A Saturday Monday
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@ -89,4 +138,12 @@ atf_init_test_cases()
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format_string_test z z +0000 +0000
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format_string_test percent % % %
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format_string_test plus + "Sat Feb 7 07:04:03 UTC 1970" "Mon Nov 12 21:20:00 UTC 2001"
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iso8601_string_test default "" "" "1970-02-07" "2001-11-12"
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iso8601_string_test date date "" "1970-02-07" "2001-11-12"
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iso8601_string_test hours hours "" "1970-02-07T07+00:00" "2001-11-12T21+00:00"
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iso8601_string_test minutes minutes "" "1970-02-07T07:04+00:00" "2001-11-12T21:20+00:00"
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iso8601_string_test seconds seconds "" "1970-02-07T07:04:03+00:00" "2001-11-12T21:20:00+00:00"
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# BSD date(1) does not support fractional seconds at this time.
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#iso8601_string_test ns ns "" "1970-02-07T07:04:03,000000000+00:00" "2001-11-12T21:20:00,000000000+00:00"
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}
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