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Full Discussion: How to convert date and timestamp?
Top Forums Shell Programming and Scripting How to convert date and timestamp? Post 302544435 by shamrock on Wednesday 3rd of August 2011 05:38:55 PM
Old 08-03-2011
Dont know how to do date arithmetic in shell or awk...as it is tedious and cumbersome but here's a perl script you can try. It reads each line from the input file and splits it into fields based on the comma delimiter...then it extracts the year month monthday etc. information from each field and converts it into seconds since the epoch and adds 5.5 hrs (converted into seconds) to it...followed by recalculating the new date and time and putting it into a tm object...
Code:
#!/usr/bin/perl

while (<>) {
    use Time::Local;
    use Time::localtime;

    @f = split /,/, $_;
    $gmt = 5*60*60 + 30*60;

    $yr = substr($f[0], 0, 4) - 1900;
    $mo = substr($f[0], 4, 2) - 1;
    $dy = substr($f[0], 6, 2);
    $hr = substr($f[1], 0, 2);
    $mi = substr($f[1], 2, 2);
    $se = substr($f[1], 4, 2);

    $epoch = timelocal($se,$mi,$hr,$dy,$mo,$yr) + $gmt;
    $tm = localtime($epoch);

    printf("%04d%02d%02d,",$tm->year+1900,$tm->mon+1,$tm->mday);
    printf("%02d%02d%02d,",$tm->hour,$tm->min,$tm->sec);
    printf("%s,%s,%s,%s,\n",$f[2],$f[3],$f[4],$f[5]);
}

Save the above perl script into a file and run it on the command line like...
Code:
your_script_name inputfile

This User Gave Thanks to shamrock For This Post:
vsachan
 

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perl::critic::policy::builtinfunctions::prohibitlvaluesubstr

Perl::Critic::Policy::BuiltinFunctions::ProhibitLvalueSuUser(Contributed Perl DocPerl::Critic::Policy::BuiltinFunctions::ProhibitLvalueSubstr(3pm)

NAME

       Perl::Critic::Policy::BuiltinFunctions::ProhibitLvalueSubstr - Use 4-argument "substr" instead of writing "substr($foo, 2, 6) = $bar".

AFFILIATION

       This Policy is part of the core Perl::Critic distribution.

DESCRIPTION

       Conway discourages the use of "substr()" as an lvalue, instead recommending that the 4-argument version of "substr()" be used instead.

	   substr($something, 1, 2) = $newvalue;     # not ok
	   substr($something, 1, 2, $newvalue);      # ok

       The four-argument form of "substr()" was introduced in Perl 5.005.  This policy does not report violations on code which explicitly
       specifies an earlier version of Perl (e.g. "use 5.004;").

CONFIGURATION

       This Policy is not configurable except for the standard options.

SEE ALSO

       "substr" in perlfunc (or "perldoc -f substr").

       "4th argument to substr" in perl5005delta

AUTHOR

       Graham TerMarsch <graham@howlingfrog.com>

COPYRIGHT

       Copyright (c) 2005-2011 Graham TerMarsch.  All rights reserved.

       This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

perl v5.14.2							    2012-06-07	 Perl::Critic::Policy::BuiltinFunctions::ProhibitLvalueSubstr(3pm)
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