G'day chrisjej,

Here's another way to do it using the builtin modules Time::Piece and Time::Seconds.

I've shown averages truncated to whole minutes (as per your OP) and also averages that haven't been truncated (i.e. shows seconds in the output). 

#!/usr/bin/env perl

use strict;
use warnings;

use Time::Piece;
use Time::Seconds;

use Test::More;

my @ranges = (
    ['11:00', '13:00', '12:00', '12:00:00'],
    ['23:00', '01:00', '00:00', '00:00:00'],
    ['23:30', '00:30', '00:00', '00:00:00'],
    ['12:00', '12:00', '12:00', '12:00:00'],
    ['00:00', '00:00', '00:00', '00:00:00'],
    ['00:00', '00:02', '00:01', '00:01:00'],
    ['00:00', '00:01', '00:00', '00:00:30'],
    ['23:58', '00:00', '23:59', '23:59:00'],
    ['23:59', '00:00', '23:59', '23:59:30'],
);

plan tests => @ranges * 2;

test_average($_) for @ranges;

sub test_average {
    my ($range) = @_;

    my $t0 = get_tp($range->[0]);
    my $t1 = get_tp($range->[1]);
    $t1 += ONE_DAY if $t1 < $t0;
    my $avg = ($t1->epoch + $t0->epoch) / 2;

    ok(
        Time::Piece->strptime($avg, '%s')->strftime('%H:%M') eq $range
+->[2],
        "$range->[0] -> $range->[1]: Avg = $range->[2]    [HH:MM]"
    );

    ok(
        Time::Piece->strptime($avg, '%s')->strftime('%H:%M:%S') eq $ra
+nge->[3],
        "$range->[0] -> $range->[1]: Avg = $range->[3] [HH:MM:SS]"
    );
} 

sub get_tp { Time::Piece->strptime(shift, '%H:%M') }

[download]

Output:

1..18
ok 1 - 11:00 -> 13:00: Avg = 12:00    [HH:MM]
ok 2 - 11:00 -> 13:00: Avg = 12:00:00 [HH:MM:SS]
ok 3 - 23:00 -> 01:00: Avg = 00:00    [HH:MM]
ok 4 - 23:00 -> 01:00: Avg = 00:00:00 [HH:MM:SS]
ok 5 - 23:30 -> 00:30: Avg = 00:00    [HH:MM]
ok 6 - 23:30 -> 00:30: Avg = 00:00:00 [HH:MM:SS]
ok 7 - 12:00 -> 12:00: Avg = 12:00    [HH:MM]
ok 8 - 12:00 -> 12:00: Avg = 12:00:00 [HH:MM:SS]
ok 9 - 00:00 -> 00:00: Avg = 00:00    [HH:MM]
ok 10 - 00:00 -> 00:00: Avg = 00:00:00 [HH:MM:SS]
ok 11 - 00:00 -> 00:02: Avg = 00:01    [HH:MM]
ok 12 - 00:00 -> 00:02: Avg = 00:01:00 [HH:MM:SS]
ok 13 - 00:00 -> 00:01: Avg = 00:00    [HH:MM]
ok 14 - 00:00 -> 00:01: Avg = 00:00:30 [HH:MM:SS]
ok 15 - 23:58 -> 00:00: Avg = 23:59    [HH:MM]
ok 16 - 23:58 -> 00:00: Avg = 23:59:00 [HH:MM:SS]
ok 17 - 23:59 -> 00:00: Avg = 23:59    [HH:MM]
ok 18 - 23:59 -> 00:00: Avg = 23:59:30 [HH:MM:SS]

[download]

— Ken

In reply to Re: Average start time handling midnight by kcott
in thread Average start time handling midnight by chrisjej

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