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+#!perl
+use strict;
+use warnings FATAL => qw(all);
+
+=prompt
+You are given a date in the format YYYY-MM-DD.
+Write a script to find day number of the year that the given date represent.
+
+Example 1
+
+Input: $date = '2025-02-02'
+Output: 33
+
+The 2nd Feb, 2025 is the 33rd day of the year.
+
+
+Example 2
+
+Input: $date = '2025-04-10'
+Output: 100
+
+
+Example 3
+
+Input: $date = '2025-09-07'
+Output: 250
+
+=cut
+
+
+
+use Time::Piece;
+use Test2::V0 -no_srand => 1;
+is(str_to_day_of_year('2025-02-02'), 33, 'Example 1');
+is(str_to_day_of_year('2025-04-10'), 100, 'Example 2');
+is(str_to_day_of_year('2025-09-07'), 250, 'Example 3');
+done_testing();
+
+sub str_to_day_of_year
+{
+     my $string = $_[0];
+     my $format = '%Y-%m-%d';
+     my $dt = Time::Piece->strptime($string, $format);
+     return $dt->day_of_year + 1; # $dt->day_of_year: 0 = Jan 01
+}