If you don't care where you round to 0 or to nearest, just truncate:

$time =~ s/\..*//;
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If you know the time has formate "HH:MM:SS.FRACTION" (that is, you always have 2 digits for hours, minutes, seconds), you can also do:

substr $time, 8, -1, "";  # Or
$time = substr $time, 0, 8;
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