Parsing of a text field which contains different date format.

Hi,

I have a text field in my monthly csv report which contains different date format. Would like to know how can I parse the date accordingly. The format of the date could be in these formats:

• 09, 30 (Indicate 9 April, 30 April)
• 03-07 (Indicate 3 April to 7 April)
• 17, 20-21 (Indicate 17 April, 20 April to 21 April)
• 24-1MAY (Indicate 24 April to 1 May)
• 4-2014 (Indicate 4 April to 1 Jan 2014)

Thanks!