You're not storing $timereceived as part of the array. If you did store it like this:
push @$records, {
timereceived => $dtevent,
...
then after the loop you could do this:
@$records = sort { $a->{timereceived} <=> $b->{timereceived} } @$recor
+ds;
because DateTime objects overload the numeric comparison operators. BTW, there does not appear to be a need for the array reference $records in your code, you could just use a plain array my @records.
Update: See also sort and How do I sort an array by (anything)?
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