I am trying to do here is to enter the time in first field and when I click on the Start button the time would be set by the value entered and started on top, showing today's date, time started and time left. I could also overwrite the value and by clicking again the timer would pickup from there. Now when a click on the stop button, I would like to set that value on the second entry box with the value of the first entry box, more like a pause button function. I am also thinking if it's possible to have some kind of warning to advise that the time is about to expire. I am new to this and if there is someone there to help me it would be very helpfull.
Thank you very much
Here is the code I have so far.

#! /perl/bin/perl5 -w

use strict;
use Tk;
use Time::HiRes qw ( gettimeofday tv_interval ) ;

my ( $mw , $msg , $msg2 , $mlabel , $id , $bf , $stime, $font_val) ;
my @bgc =( "#000000");

my $main = MainWindow->new;

$mlabel = $main->Label ( -textvariable => \$msg )-> pack ( -side => "t
+op" ) ;

$main->Label(-text => 'Enter Time')->pack;

my $font = $main->Entry(-width => 20);
$font->pack;

my $filename = $main->Entry(-width => 20);
$filename->pack;

#test
#$font = $main->Label(-textvariable => \$font_val);$font->pack;
##

$main->Button(-text => 'Start',
      -command => sub{do_time($filename, $font)}
      )->pack( -side => "left", -padx => 5 ) ;
      
$main->Button(-text => 'Print',
      -command => sub{do_print($filename, $font)}
      )->pack( -side => "left" , -padx => 5 ) ;
      
$main->Button ( -text => "Exit" , -command => \&on_done )->pack ( -sid
+e => "left", -padx => 5 ) ;

$mlabel = $main->Button ( -text => "Start Timer" , -command => \&on_st
+art )->pack ( -side => "left", -padx => 5 ) ;

$main->Button ( -text => "Stop" , -command => \&on_stop )->pack ( -sid
+e => "left" , -padx => 5 ) ;

 $main->Label(-textvariable => \$font_val)->pack( -side => "top" );
      
MainLoop;
sub do_time {
    my ($file, $font) = @_;
    my $file_val = $file->get;
    my $font_val = $font->get;
    
    print "Now Time is $file_val in $font_val\n";
    
    $main->Label(-textvariable => \$font_val)->pack( -side => "top" );
+          
    
}


sub do_print {
    my ($file, $font) = @_;
    my $file_val = $file->get;
    my $font_val = $font->get;
    print "Sending file $file_val to printer in $font_val\n";
}

sub on_done()
{
exit ;
}

sub on_timer()
{
my $t = time ;
my @d = localtime $t ;
my $elapsed;
my $bc;
$msg = sprintf ( "%04d-%02d-%02d %02d:%02d:%02d" , $d[5]+1900 , $d[4]+
+1 , $d[3] , $d[2] , $d[1] , $d[0] ) ;

$elapsed = tv_interval ( $stime ) ;
$msg = sprintf ( "%0.2f" , $elapsed ) ;

#
#my $bc = $bgc[ int($elapsed) % 8 ] ;
#$main->configure ( -background => $bc ) ;
#$bf->configure ( -background => $bc ) ;

#return if $id ;
#$stime = [gettimeofday] ;
#$id = $mlabel;
}
sub on_start()
{
return if $id ;
$stime = [gettimeofday] ;
$id = $mlabel->repeat ( 50 , \&on_timer ) ;
}
sub on_stop()
{
return unless $id ;
$id->cancel() ;
$id = undef ;
}
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