[eluser]NotDior[/eluser]
This is possible, but you have to build your arrays, for the dates with another level. So basically you'll have something similar to this.
Code:
Array
(
[4] => Array
(
[0] => April 4th Entry
)
[9] => Array
(
[0] => April 9th Entry
)
[10] => Array
(
[0] => April 10th
[1] => April 10th
[2] => April 10th
[3] => April 10th
)
)