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Top Forums Shell Programming and Scripting Compare the system date with date from a text file Post 302992014 by Chubler_XL on Monday 20th of February 2017 03:18:52 PM
Old 02-20-2017
Quote:
Originally Posted by Loc
Jul 28 14:57 2017 GMT
How do I convert this date to the number of seconds, so I can compare it to the system date? If it is over 2 days old.
I have this code but it doesn't work. I'm getting an error message when I ran it. I think its because $dateFile is a text file and it doesn't know how to convert it.
Any help would be appreciated.
Edit: I just noticed you have cut the minutes value out of the original date - I'm assuming this was a mistake and your cut command should probably have been cut -d ':' -f 2-4

If your system has GNU date you can use date -d STRING to display time described by STRING eg:

Code:
$ date -d "Jul 28 14:09:57 2017 GMT" +%s
1501250997

If you don't have GNU date you can use a perl program to achieve the same thing (most systems seem to have perl available).

save this a epoch.pl and chmod +x epoch.pl:
Code:
#!/bin/perl
use POSIX;
use Time::Local;

my %mon;
@mon{qw/Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec/} = 0..11;

my ($mth, $d, $h, $m, $s, $y) = split(/[: ]/, $ARGV[0]);

eval {
  printf "%d\n", timegm(0, $m, $h,$d,$mon{$mth}, $y)
};
printf "ERROR" if $@;


The you can call it like this
Code:
$ ./epoch.pl "Jul 28 14:09:57 2017 GMT"
1501250997


Last edited by Chubler_XL; 02-20-2017 at 04:45 PM..
 

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DATE(1) 						      General Commands Manual							   DATE(1)

NAME
date - print or set the date and time SYNOPSIS
date [-qsu] [[MMDDYY]hhmm[ss]] [+format] OPTIONS
-q Read the date from stdin -s Set the time (implicit for -q or a date string) -u Print the date as GMT -t Use this number of seconds instead of current time EXAMPLES
date # Print the date and time date 0221921610 # Set date to Feb 21, 1992 at 4:10 p.m. DESCRIPTION
With the -q flag or a numeric argument, date sets the GMT time and date. MMDDYY refers to the month, day, and year; hhmmss refers to the hour, minute and second. Each of the six fields must be exactly two digits, no more and no less. date always display the date and time, with the default format for the system. The -u flag request GMT time instead of local time. A format may be specified with a + followed by a printf-like string with the following options: %% % character %A Name of the day %B Name of the month %D mm/dd/yy %H Decimal hour on 2 digits %I Decimal hour modulo 12 on 2 digits %M Decimal minute on 2 digits %S Decimal seconds on 2 digits %T HH:MM:SS %U Decimal week number, Sunday being first day of week %W Decimal week number, Monday being first day of week %X Same as %T %Y Decimal year on 4 digits %Z Time Zone (if any) %a Abbreviated name of the day %b Abbreviated name of the month %c Appropriate date & time (default format) %d Decimal day of the month on 2 digits %e Same as %d, but a space replaces leading 0 %h Same as %b %j Decimal dey of the year on 3 digits %m Decimal month on 2 digits %n Newline character %p AM or PM %r 12-hour clock time with AM/PM %s Number of seconds since the epoch %t Tab character %w Decimal day of the week (0=Sunday) %x Same as %D %y Decimal year on 2 digits SEE ALSO
time(2), ctime(3), readclock(8). DATE(1)
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