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Allow the year to be specified with an optional century.

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PR:	14472
Reported by:	j_guojun@lbl.gov (Jin Guojun)
This commit is contained in:
Sheldon Hearn 1999-11-10 13:34:39 +00:00
parent 150c3a33b9
commit 646e0924a1
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=53082
2 changed files with 14 additions and 4 deletions
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6
bin/date/date.1
View File

@ -49,7 +49,7 @@
.Op Fl t Ar minutes_west
.Op Fl v Ns Ar [+|-]val Ns Op ymwdHMS
.Ar ...
.Op Fl f Ar fmt Ar date | [[[[yy]mm]dd]HH]MM[\&.ss]
.Op Fl f Ar fmt Ar date | [[[[[cc]yy]mm]dd]HH]MM[\&.ss]
.Op Cm + Ns Ar format
.Sh DESCRIPTION
.Nm Date
@ -74,7 +74,7 @@ Use
.Ar fmt
as the format string to parse the date provided rather than using
the default
.Ar [[[[yy]mm]dd]HH]MM[.ss]
.Ar [[[[[cc]yy]mm]dd]HH]MM[.ss]
format. Parsing is done using
.Xr strptime 3 .
.It Fl j
@ -168,6 +168,8 @@ a value for setting the system's notion of the current date and time.
The canonical representation for setting the date and time is:
.Pp
.Bl -tag -width Ds -compact -offset indent
.It Ar cc
Century (either 19 or 20) prepended to the abbreviated year.
.It Ar yy
Year in abbreviated form (e.g. 89 for 1989, 06 for 2006).
.It Ar mm

12
bin/date/date.c
View File

@ -175,6 +175,8 @@ main(argc, argv)
}
#define ATOI2(ar) ((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2;
#define ATOI4(ar) ((ar)[0] - '0') * 1000 + ((ar)[1] - '0') * 100 + \
((ar)[2] - '0') * 10 + ((ar)[3] - '0'); (ar) += 4;
void
setthetime(fmt, p, jflag, nflag)
const char *fmt;
@ -221,11 +223,16 @@ setthetime(fmt, p, jflag, nflag)
/* if p has a ".ss" field then let's pretend it's not there */
switch (strlen(p) - ((dot != NULL) ? 3 : 0)) {
case 12: /* cc */
lt->tm_year = -1900 + ATOI4(p);
if (lt->tm_year < 0)
badformat();
goto year_done;
case 10: /* yy */
lt->tm_year = ATOI2(p);
if (lt->tm_year < 69) /* hack for 2000 ;-} */
lt->tm_year += 100;
/* FALLTHROUGH */
year_done: /* FALLTHROUGH */
case 8: /* mm */
lt->tm_mon = ATOI2(p);
if (lt->tm_mon > 12)
@ -286,6 +293,7 @@ usage()
(void)fprintf(stderr, "%s\n%s\n",
"usage: date [-nu] [-d dst] [-r seconds] [-t west] "
"[-v[+|-]val[ymwdHMS]] ... ",
" [-f fmt date | [[[[yy]mm]dd]HH]MM[.ss]] [+format]");
" "
"[-f fmt date | [[[[[cc]yy]mm]dd]HH]MM[.ss]] [+format]");
exit(1);
}