Here's one way to do it, using a regex to match the HH:MM:SS timestamp that occurs at the end of the date string.

use strict;
my @dates;
# read in @array, then ..

foreach (@array) {
    # there is no doubt a more stylish way to do this, but ...
    #regex matches the part of $_ up to the point it finds the pattern
    # two digits followed by a colon (etc.)
    /(^.*?\d\d:\d\d:\d\d)/;
    # pushes the part of the string matched into the dates array
    push @dates,  $1;
}
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