diff --git a/bibcop.pl b/bibcop.pl
index 08a0a57..bbbb3f2 100755
--- a/bibcop.pl
+++ b/bibcop.pl
@@ -26,8 +26,8 @@ package bibcop;
 
 use warnings;
 use strict;
+use POSIX;
 use File::Basename;
-use Time::Piece;
 
 # Hash of incoming command line arguments.
 my %args = map { $_ => 1 } @ARGV;
@@ -543,7 +543,7 @@ sub entry_fix {
     }
     my $value = clean_tex($entry{$tag});
     if ($tag eq 'url') {
-      my $today = localtime->strftime('%d-%m-%Y');
+      my $today = strftime('%d-%m-%Y', localtime(time));
       push(@lines, "  howpublished = {\\url{$value}},");
       push(@lines, "  note = {[Online; accessed $today]},");
       next;
diff --git a/perl-tests/entry_fixing.pl b/perl-tests/entry_fixing.pl
index e81c0c2..bcf935a 100755
--- a/perl-tests/entry_fixing.pl
+++ b/perl-tests/entry_fixing.pl
@@ -25,14 +25,15 @@ package bibcop;
 
 use strict;
 use warnings;
-use Time::Piece;
+
+use POSIX;
 
 require './bibcop.pl';
 
 fixes_entry({':name' => 'knuth78', ':type' => 'book', 'title' => 'The TeX Book'}, "\@book{knuth78,\n  title = {{The TeX Book}},\n}\n\n");
 fixes_entry({':name' => 'k', ':type' => 'article', 'title' => 'Book', 'pages' => ''}, "\@article{k,\n  title = {{Book}},\n}\n\n");
 
-my $today = localtime->strftime('%d-%m-%Y');
+my $today = strftime('%d-%m-%Y', localtime(time));
 fixes_entry({':name' => 'f', ':type' => 'misc', 'url' => 'http://google.com'}, "\@misc{f,\n  howpublished = {\\url{http://google.com}},\n  note = {[Online; accessed $today]},\n}\n\n");
 
 fixes_entry({':name' => 'f', ':type' => 'article', 'booktitle' => 'ONE'}, "\@article{f,\n  journal = {{ONE}},\n}\n\n");
diff --git a/perl-tests/functions.pl b/perl-tests/functions.pl
index 10bc8b5..8d8f925 100755
--- a/perl-tests/functions.pl
+++ b/perl-tests/functions.pl
@@ -26,12 +26,12 @@ package bibcop;
 use strict;
 use warnings;
 
-assert(clean_tex('Hello,   \LaTeX{}!'), 'Hello, \LaTeX{}!');
-assert(clean_tex("Hello,\n\\TeX{}!"), 'Hello, \TeX{}!');
-assert(clean_tex("  Gamma!"), 'Gamma!');
-assert(clean_tex("Hello!  "), 'Hello!');
-assert(clean_tex('{Alpha}'), 'Alpha');
-assert(clean_tex('{{Beta}}'), 'Beta');
-assert(clean_tex('Hello, {world!}'), 'Hello, {world!}');
+assert_eq(clean_tex('Hello,   \LaTeX{}!'), 'Hello, \LaTeX{}!');
+assert_eq(clean_tex("Hello,\n\\TeX{}!"), 'Hello, \TeX{}!');
+assert_eq(clean_tex("  Gamma!"), 'Gamma!');
+assert_eq(clean_tex("Hello!  "), 'Hello!');
+assert_eq(clean_tex('{Alpha}'), 'Alpha');
+assert_eq(clean_tex('{{Beta}}'), 'Beta');
+assert_eq(clean_tex('Hello, {world!}'), 'Hello, {world!}');
 
 1;
\ No newline at end of file
diff --git a/perl-tests/parsing.pl b/perl-tests/parsing.pl
index c5e9b13..b61fe4c 100755
--- a/perl-tests/parsing.pl
+++ b/perl-tests/parsing.pl
@@ -28,56 +28,56 @@ package bibcop;
 
 my @i1 = entries('@Misc{knuth-1984:x, author  ={Donald Knuth}, Title="The TeX Book "}');
 # show(@i1);
-assert(@i1+0, 1);
-assert($i1[0]{':name'}, 'knuth-1984:x');
-assert($i1[0]{':type'}, 'Misc');
-assert($i1[0]{'author'}, 'Donald Knuth');
-assert($i1[0]{'title'}, 'The TeX Book ');
+assert_eq(@i1+0, 1);
+assert_eq($i1[0]{':name'}, 'knuth-1984:x');
+assert_eq($i1[0]{':type'}, 'Misc');
+assert_eq($i1[0]{'author'}, 'Donald Knuth');
+assert_eq($i1[0]{'title'}, 'The TeX Book ');
 
 my @i2 = entries('@misc{patrick, author={{Patrick S\:{u}skind}},}');
 # show(@i2);
-assert(@i2+0, 1);
-assert($i2[0]{'author'}, '{Patrick S\:{u}skind}');
+assert_eq(@i2+0, 1);
+assert_eq($i2[0]{'author'}, '{Patrick S\:{u}skind}');
 
 my @i3 = entries('@misc{p1} @article{p2,author="Jeff"} ');
 # show(@i3);
-assert(@i3+0, 2);
-assert($i3[0]{':name'}, 'p1');
-assert($i3[1]{':name'}, 'p2');
-assert($i3[1]{'author'}, 'Jeff');
+assert_eq(@i3+0, 2);
+assert_eq($i3[0]{':name'}, 'p1');
+assert_eq($i3[1]{':name'}, 'p2');
+assert_eq($i3[1]{'author'}, 'Jeff');
 
 my @i4 = entries('@misc{x1, year =   1989   }');
 # show(@i4);
-assert(@i4+0, 1);
-assert($i4[0]{'year'}, '1989');
+assert_eq(@i4+0, 1);
+assert_eq($i4[0]{'year'}, '1989');
 
 my @i5 = entries('@misc{x2,year=2021,}');
 # show(@i5);
-assert(@i5+0, 1);
-assert($i5[0]{'year'}, '2021');
+assert_eq(@i5+0, 1);
+assert_eq($i5[0]{'year'}, '2021');
 
 my @i6 = entries('@misc{x2,year=2021,year=1989}');
 # show(@i6);
-assert(@i6+0, 1);
-assert($i6[0]{'year'}, '2021');
+assert_eq(@i6+0, 1);
+assert_eq($i6[0]{'year'}, '2021');
 
 my @i7 = entries("\% a comment\n \@misc{7}\n");
 # show(@i7);
-assert(@i7+0, 1);
+assert_eq(@i7+0, 1);
 
 my @i8 = entries("\@misc{foo33, title={It's 100\\% true!}}\n");
 # show(@i8);
-assert(@i8+0, 1);
+assert_eq(@i8+0, 1);
 
 # These are all parsing errors
-assert(entries('no bibs')+0, 0);
-assert(entries('@misc{---}')+0, 0);
-assert(entries('@misc{hello, ??}')+0, 0);
+assert_eq(entries('no bibs')+0, 0);
+assert_eq(entries('@misc{---}')+0, 0);
+assert_eq(entries('@misc{hello, ??}')+0, 0);
 
-assert(entries('')+0, 0);
-assert(entries('@misc{k1,a={{x}{y}{}},b="{f}{x}",}')+0, 1);
-assert(entries('@article{k1_34} @misc{do43ss,Title=,Year=1998}')+0, 2);
-assert(entries("\@article{t1}\n\n\n\@misc{ff,year=1998}")+0, 2);
-assert(entries('@misc{42i-88/7.7,a=hello}')+0, 1);
+assert_eq(entries('')+0, 0);
+assert_eq(entries('@misc{k1,a={{x}{y}{}},b="{f}{x}",}')+0, 1);
+assert_eq(entries('@article{k1_34} @misc{do43ss,Title=,Year=1998}')+0, 2);
+assert_eq(entries("\@article{t1}\n\n\n\@misc{ff,year=1998}")+0, 2);
+assert_eq(entries('@misc{42i-88/7.7,a=hello}')+0, 1);
 
 1;
\ No newline at end of file
diff --git a/tests.pl b/tests.pl
index c0e6900..b124f0b 100755
--- a/tests.pl
+++ b/tests.pl
@@ -27,7 +27,7 @@ package bibcop;
 use strict;
 
 # Assert on the value and exit if error.
-sub assert {
+sub assert_eq {
   my ($l, $r) = @_;
   if ($l ne $r) {
     print "'$l' ne '$r'\n";