Peter, a one main problem I think...
The LastRainTipISO entry in your ccr file is in the format: "5/12/2012:32", which is obviously not a valid date/time.
The script is expecting WD to supply the date in dd/mm/yy format, so it looks like your string is missing both the space between the date and time and the hours. I think it should be "5/12/2012 ??:32".