Is this a homework assignment?

What have you tried to solve this problem?

Do these date and time stamps appear on lines by themselves? Or at the start of lines? Or at a fixed location other than the start of a line? If not, how can the date and time stamps be uniquely identified as distinct from other text that might appear in your data?

Is this data contained in a text file? What is the format of data in your input file other than the date and time strings?

Is this a stand-alone project, or is other processing going to be done to your data at the same time? If other processing is being done, what tools are being used to do the other processing?

Your sample data and the format you showed us for your sample data is inconsistent. Is there one space between the day and the year as shown in:

Code:

Mon DD YYYY hh:mi:ss AM/PM

Or are there two spaces as shown in:

Code:

Jan 01  2015 11:00:00 PM

?