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Full Discussion: modifying date (-10 hours) in the content of a file
Top Forums Shell Programming and Scripting modifying date (-10 hours) in the content of a file Post 302252605 by summer_cherry on Wednesday 29th of October 2008 11:57:29 PM
Old 10-30-2008
input(a):
Code:
2008.10.24 23:41:13
2008.10.24 22:41:13
2008.10.24 09:41:13

output:
Code:
2008.10.24 23:41:13
2008.10.24 22:41:13
2008.10.23 23:41:13

code:
Code:
open FH,"<a";
while(<FH>){
        $_=~tr/\n//d;
        $str=rep($_,"H",10);
        print $str,"\n";
}
close FH;
sub rep{
        $time=shift;
        $flag=shift;
        $gap=shift;
        @arr=split("[.| |:]",$time);
        if($flag eq "H"){
                my $temp=$arr[3]-$gap;
                if($temp<0){
                        $arr[3]=$temp+24;
                        $arr[2]-=1;
                }
        }
        if($flag eq "M"){
                my $temp=$arr[4]-$gap;
                if($temp<0){
                        $arr[4]=$temp+60;
                        $arr[3]-=1;
                }
        }
        if($flag eq "S"){
                my $temp=$arr[5]-$gap;
                if($temp<0){
                        $arr[5]=$temp+60;
                        $arr[4]-=1;
                }
        }
        return "$arr[0].$arr[1].$arr[2] $arr[3]:$arr[4]:$arr[5]";
}

 

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LEARN ABOUT CENTOS

sttime

sttime(3)                                                   ShapeTools Toolkit Library                                                   sttime(3)

NAME

       stMktime, stWriteTime - date and time handling

SYNOPSIS

       #include <config.h>
       #include <sttk.h.h>

       time_tstMktime (char *string);

       char*stWriteTime (time_t date);

DESCRIPTION

       stMktime scans the given string and tries to read a date and time from it. It understands various formats of date strings. The following is
       a list of all valid formats, optional parts in brackets.

       [Tue] Jan 5[,] [19]93
                     This includes the standard asctime(3) format.

       Jan 5         With no year given, the year defaults to the current year.

       [19]93/01/05  This notation requires month and day represented by exactly two digits.

       5.1.[19]93    This is the usual German notation.

       5.1.          German notation referencing the current year.

       A certain time, given together with the date must always have the following form.

       hours:minutes[:seconds]
                       Each of the fields must be an integer value within the proper range (hours: 0-23, minutes and seconds: 0-59). Values  below
                       10 may be written as one digit numbers.

       The  time  value  may be placed anywhere in the date string: at the beginning, at the end, or somewhere in the middle. Any amount of white-
       space may be given between a field of the time value and the separating colon. The time is always considered to be local time.

       stWriteTime generates a time string similar to asctime(3) from its date argument.

SEE ALSO

       asctime(3)

BUGS

       Time Zone Names within the time string (like `MET') are not handled properly. In most cases they will cause a failure.

sttk-1.7                                                     Thu Jun 24 17:43:35 1993                                                    sttime(3)
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