Having a limited memory, please help me to recall the solution

i have cell values below in a column of *text dates* <m/d/yyyy

'5/5/2008
'3/19/2008
'5/6/2008
'4/12/2008
'3/26/2008
'12/28/2008

problem is - it was imported and i need them to be reckognized as real date
values by xls 03. The * ' * is quite hard for me to recall of how i can
clean them.

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regards,