[BUG]

[gareth-ib]

All the date calls in the samples need both end less than and greater than values or they will break.
The server side doesn't properly handle when a lessThan does not exist.
They need updating to be along the lines of this.

        $getSentEvent->filter = [
            'LeftOperand'       => [
                'Property'          => 'EventDate',
                'SimpleOperator'    => 'greaterThan',
                'DateValue'         => "2020-01-01T00:00:00.000"
            ],
            'LogicalOperator'   => 'AND',
            'RightOperand'      => [
                'Property'          => 'EventDate',
                'SimpleOperator'    => 'lessThan',
                'DateValue'         => "2020-01-02T00:00:00.000"
            ]
        ];