import re, time, datetime
 
text = 'this amendment of lease, made and entered as of the  10th day of august, 2016,   by and between john doe and jane smith this agreement, made and entered as of May 1, 2016, between john doe and jane smith'
 
regex = re.compile('(?:(\d{1,2})(?:th|nd|rd).* ([a-z]{3})[a-z]*|([a-z]{3})[a-z]* (\d{1,2})),\s*(\d{4})', re.I)
 
for x in regex.findall(text):
	if x[0] == '':
		date = '-'.join(filter(None, x))
	else:
		date = '%s-%s-%s' % (x[1],x[0],x[4])
 
	print(datetime.datetime.strptime(date, '%b-%d-%Y').date())
 

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