diff --git a/lib/Subtitle/SRT.pm b/lib/Subtitle/SRT.pm
index 9ba0321..bd36027 100644
--- a/lib/Subtitle/SRT.pm
+++ b/lib/Subtitle/SRT.pm
@@ -2,9 +2,10 @@ package Subtitle::SRT;
 
 use strict;
 use warnings;
-use feature qw(switch);
 use utf8;
 
+use Subtitle::Utils qw(:string :timing);
+
 use base 'Subtitle::BASE';
 
 sub new {
@@ -15,7 +16,7 @@ sub new {
     %args,
     events => [],
     log    => [],
-    timing_fmt => "%02d:%02d:%02d,%s",
+    timing_fmt => "%02d:%02d:%02d,%03d",
   };
 
   return bless($self, $class);
@@ -28,13 +29,14 @@ sub parse {
   my $linenum = 0;
   my $event;
 
-  foreach my $line (@$lines) {
+  foreach my $line (@{ $lines }) {
     $linenum++;
-    $line = $self->chomp($line);
+    chomp_all($line);
     # expected: event id
     if ($line and not $event) {
       $event = $self->new_event;
-      $event->{id} = $self->trim($line);
+      trim($line);
+      $event->{id} = $line;
       $self->log(debug => "New event with id: $event->{id}");
       next;
     }
@@ -47,16 +49,18 @@ sub parse {
         $self->log(warn => "Expected timing but found `$line` at $linenum, skipped");
         next;
       }
-      unless (defined ($timing->[0] = $self->parse_timing($start))) {
+      $timing->[0] = parse_timing($start);
+      unless ($timing->[0] >= 0) {
         $self->log(warn => "Can't parse timing at line $linenum: $start");
         next;
       }
-      unless (defined ($timing->[1] = $self->parse_timing($end))) {
+      $timing->[1] = parse_timing($end);
+      unless ($timing->[1] >= 0) {
         $self->log(warn => "Can't parse timing at line $linenum: $end");
         next;
       }
       $event->{timing} = $timing;
-      $rest = $self->trim($rest);
+      trim($rest);
       next unless $rest;
       # extension: timing
       # example:  X1:050 X2:669 Y1:234 Y2:436
@@ -81,8 +85,9 @@ sub parse {
         $rest = $1;
         foreach my $token (split(/\s*,\s*/, $rest)) {
           next unless $token =~ m/^(\S+):\s*(.+)/o;
+          trim($2);
           $event->{style} //= {};
-          $event->{style}->{lc($1)} = $self->trim($2);
+          $event->{style}->{lc($1)} = $2;
         }
         next;
       }
@@ -98,15 +103,14 @@ sub parse {
     }
     # expected: event text
     if ($line and $event and $event->{timing}) {
+      trim($line);
       $self->log(debug => "Text line at $linenum -> append");
-      if ($event->{text}) {
-        $event->{text} .= $self->{eol} . $self->trim($line);
-      } else {
-        $event->{text} = $self->trim($line);
-      }
+      $event->{text} //= '';
+      $event->{text} .= $self->{eol} if $event->{text};
+      $event->{text} .= $line;
       next;
     }
-  }
+  } # foreach @lines
   # finalize last event
   if ($event and $event->{timing} and $event->{text}) {
     push @{ $self->{events} }, $event;
@@ -117,13 +121,16 @@ sub parse {
 
 sub build {
   my ($self) = @_;
-  my $out = "";
+  my ($hrs, $min, $sec, $msec, $out);
 
+  $out = '';
   foreach my $e (@{ $self->{events} }) {
-    $out .= "$e->{id}\n";
-    $out .= sprintf "%s --> %s\n",
-      $self->build_timing($e->{timing}->[0], 3, ','),
-      $self->build_timing($e->{timing}->[1], 3, ',');
+    $out .= $e->{id} . "\n";
+    my $start = sprintf $self->{timing_fmt},
+      make_timing($e->{timing}->[0]);
+    my $end   = sprintf $self->{timing_fmt},
+      make_timing($e->{timing}->[1]);
+    $out .= sprintf "%s --> %s\n", $start, $end;
     $out .= "$e->{text}\n";
     $out .= "\n";
   }