How to Sort by Date and Time

Hi,

The input file is as follows,

22.06.2012 17:58:38 CPUser: xxxxxxx, billedAfterStatus: Active
13.07.2012 08:46:15 CPUser: xxxxxxx, billedAfterStatus: Active
20.07.2012 08:56:24 CPUser: xxxxxxx, billedAfterStatus: Active
20.03.2012 08:56:24 CPUser: xxxxxxx, billedAfterStatus: Active
20.05.2012 08:56:24 CPUser: xxxxxxx, billedAfterStatus: Active

and we need output a follows,

20.03.2012 08:56:24 CPUser: xxxxxxx, billedAfterStatus: Active
20.05.2012 08:56:24 CPUser: xxxxxxx, billedAfterStatus: Active
22.06.2012 17:58:38 CPUser: xxxxxxx, billedAfterStatus: Active
13.07.2012 08:46:15 CPUser: xxxxxxx, billedAfterStatus: Active
20.07.2012 08:56:24 CPUser: xxxxxxx, billedAfterStatus: Active

which command i have to use?

Please Suggest me.

Regards,
Nanthagopal A