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diff --git a/lib/JWebmail/View/Webmail.pm b/lib/JWebmail/View/Webmail.pm
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+package JWebmail::View::Webmail;
+
+use Mojo::Base -base;
+
+use POSIX qw(floor round log);
+
+
+### template formatting functions
+
+sub print_sizes10 {
+    shift;
+    my $var = shift || return '0 Byte';
+
+    my $i = floor(((log($var)/log(10))+1e-5) / 3);
+    my $expo = $i * 3;
+
+    my @PREFIX;
+    $PREFIX[0] = 'Byte';
+    $PREFIX[1] = 'kByte';
+    $PREFIX[2] = 'MByte';
+    $PREFIX[3] = 'GByte';
+    $PREFIX[4] = 'TByte';
+    $PREFIX[5] = 'PByte';
+
+    return sprintf('%.0f %s', $var / (10**$expo), $PREFIX[$i]);
+}
+
+sub print_sizes2 {
+    shift;
+    my $var = shift || return '0 Byte';
+
+    my $i = floor(((log($var)/log(2))+1e-5) / 10);
+    my $expo = $i * 10;
+    my %PREFIX = (
+        0 => 'Byte',
+        1 => 'KiByte',
+        2 => 'MiByte',
+        3 => 'GiByte',
+        4 => 'TiByte',
+        5 => 'PiByte',
+    );
+    my $pref = $PREFIX{$i};
+    return round($var / (2**$expo)) . " $pref";
+}
+
+my sub dgt { "([[:digit:]]{$_[0]})" }
+
+sub parse_iso_date {
+    shift;
+    state $rx = do { my $re = dgt(4).'-'.dgt(2).'-'.dgt(2).'T'.dgt(2).':'.dgt(2).':'.dgt(2); qr/$re/a };
+    my @d = shift =~ /$rx/;
+    if (@d != 6) {
+        # TODO
+        warn "issue when parsing date";
+    }
+    return {
+        year  => $d[0],
+        month => $d[1],
+        mday  => $d[2],
+        hour  => $d[3],
+        min   => $d[4],
+        sec   => $d[5],
+    };
+}
+
+1
+
+__END__
+
+=head1 VIEW METHODS
+
+=head2 print_sizes10
+
+A helper for templates used to format byte sizes.
+
+  $app->helper(print_sizes10 => sub { shift; JWebmail::Plugin::Helper::print_sizes10(@_) });
+
+  %= print_sizes10 12345 # => 12 kB
+
+=head2 print_sizes2
+
+A helper for templates used to format byte sizes.
+
+  %= print_sizes10 12345 # => 12 KiB
+
+This is not registered by default.
+
+=head2 parse_iso_date