I'm not sure if any of this is causing the error you show but there are a couple of things wrong in your code.

In the first case one of your eventdates is clobbered by the other, and you need to change '=<' to '<=':

my @events = $schema->resultset( 'MyTable' )->search({
        eventdate => { '>=' => $date1, '<=' => $date2 }
    });

[download]
In the second case 'between' should be '-between': 
my @events = $schema->resultset( 'MyTable' )->search({
        eventdate => { -between => [ $date1, $date2 ] }
    });

[download]

In reply to Re: Querying Date Ranges with DBIx::Class by tangent
in thread Querying Date Ranges with DBIx::Class by phildeman

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