That's the issue, to search for specific user posts, you really need to use the built-in search functions; Google isn't going to have that context. I added more years to that drop-down to give a bit more flexibility, but it's still not quite as flexible as a completely custom range option.
By choosing a certain year filter, and then choosing ascending / descending from that point in time, it might get you close to that though.
more dates.gif