fulldata={}

line = "February 29, 2029 at 07:31AM You entered the office"
matched = re.search('(^\w.*\d) at (\d.*\w) You (\w.*\w) the office', line)
if matched:
    date = matched.group(1)
    time = matched.group(2)
    action = matched.group(3)
    print("Date#",date,"#")
    fulldata[date][action] =time
else:
    print ("ERROR")