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Full Discussion: Date validation
The Lounge What is on Your Mind? Date validation Post 302980654 by jim mcnamara on Wednesday 31st of August 2016 08:51:42 AM
Old 08-31-2016
Here is the why behind Don's correct comment about touch - the answer is the mktime STDC library call. It tries to "fix" bad dates.

Code:
//  mktime_test.c
#include <stdio.h>
#include <time.h>
// mktime attempts correction for bad dates given to other 
//     utilities like touch.

int main(void)
{
   struct tm time_str;
    char buf[30]={0x0};
    time_str.tm_year = 116;// which is 2016 - 1900
    time_str.tm_mon =  5;  // June, months are 0 - 11
    time_str.tm_mday = 34; // June 34 which is wrong
    time_str.tm_hour = 0;
    time_str.tm_min = 0;
    time_str.tm_sec = 1;   // first second of the day
    time_str.tm_isdst = -1;  // figure out whether DST is active or not
    if (mktime(&time_str) == -1) // error, note that mktime attempts to correct "bad" values.
        fprintf(stderr,"Bad input\n");
    else 
    {
        (void)strftime(buf, sizeof(buf), "%c", &time_str);
         printf("%s: time_str.tm_mon=%d  time_str.tm_mday=%d\n",
                buf, time_str.tm_mon, time_str.tm_mday);
    }
    return 0;
}

Example run:

Code:
$ ./mktime
Mon Jul  4 00:00:01 2016: time_str.tm_mon=6  time_str.tm_mday=4

The bad date was "fixed" to July 4.
This User Gave Thanks to jim mcnamara For This Post:
RavinderSingh13
 

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LEARN ABOUT XFREE86

touch

TOUCH(1)							   User Commands							  TOUCH(1)

NAME

       touch - change file timestamps

SYNOPSIS

       touch [OPTION]... FILE...

DESCRIPTION

       Update the access and modification times of each FILE to the current time.

       A FILE argument that does not exist is created empty, unless -c or -h is supplied.

       A FILE argument string of - is handled specially and causes touch to change the times of the file associated with standard output.

       Mandatory arguments to long options are mandatory for short options too.

       -a     change only the access time

       -c, --no-create
	      do not create any files

       -d, --date=STRING
	      parse STRING and use it instead of current time

       -f     (ignored)

       -h, --no-dereference
	      affect each symbolic link instead of any referenced file (useful only on systems that can change the timestamps of a symlink)

       -m     change only the modification time

       -r, --reference=FILE
	      use this file's times instead of current time

       -t STAMP
	      use [[CC]YY]MMDDhhmm[.ss] instead of current time

       --time=WORD
	      change the specified time: WORD is access, atime, or use: equivalent to -a WORD is modify or mtime: equivalent to -m

       --help display this help and exit

       --version
	      output version information and exit

       Note that the -d and -t options accept different time-date formats.

DATE STRING

       The  --date=STRING is a mostly free format human readable date string such as "Sun, 29 Feb 2004 16:21:42 -0800" or "2004-02-29 16:21:42" or
       even "next Thursday".  A date string may contain items indicating calendar date, time of day, time zone, day of week, relative time,  rela-
       tive  date,  and numbers.  An empty string indicates the beginning of the day.  The date string format is more complex than is easily docu-
       mented here but is fully described in the info documentation.

AUTHOR

       Written by Paul Rubin, Arnold Robbins, Jim Kingdon, David MacKenzie, and Randy Smith.

REPORTING BUGS

       GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
       Report touch translation bugs to <http://translationproject.org/team/>

COPYRIGHT

       Copyright (C) 2017 Free Software Foundation, Inc.  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

       Full documentation at: <http://www.gnu.org/software/coreutils/touch>
       or available locally via: info '(coreutils) touch invocation'

GNU coreutils 8.28						   January 2018 							  TOUCH(1)
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