dt.py

dt.py

import re
import sys
p = re.compile("([0-9]{1,2}/[0-9]{1,2}/[0-9]{2,4} [0-9]{1,2}:[0-9]{2}:[0-9]{2}( (AM|PM|am|pm))?)")
for x in p.findall(sys.stdin.read()):
    print x[0]

This Python script prints all date-like strings of the form #/#/#### #:##:## and ##/##/#### ##:##:## as well as some other permutations that probably aren't dates.

It will almost certainly print things that look like dates but aren't actually, but it should be a reasonable starting point.

Run it like follows from the command line:

C:\> python dt.py < somefile.txt

You will need to install Python, of course.