Calculating Dates From Text

I have two columns. The first column contains cells with multiple date values in text format (YYYY/MM/DD) in each cell. The other I was planning to be Calculated cells that I thought would compare the string of text (possibly converted to numbers) and determine which is the next in sequence after today's date. As there may be numbers in the past I cannot just use the first item.

The cell of text looks like this:2009-03-27 00:00:00
2009-04-10 00:00:00
2009-04-29 00:00:00
2009-05-13 00:00:00
2009-05-27 00:00:00

The calculated cell (based on today's date) should output:2009-04-10 00:00:00
Problem: I've been unable to figure out a calculation that will accomplish this. The idea I had was to examine the text in pieces and compare them numerically to "today" (as a number instead of a date).

I'm not very adept with Excel functions yet. I've started with this: "=(MID(A2,2,10))" but all it does is return the first item. I also tried using a Replace function to get rid of the dashes and also one that would return the dates as a decimal. But while I can get the numbers to change format, I don't know how to do the compare...