from datetime import datetime
# https://www.pg4e.com/code/datecompat.py

# Non-dateutil version - we try our best
def parsemaildate(md) :

    pieces = md.split()
    notz = " ".join(pieces[:4]).strip()

    # Try a bunch of format variations - strptime() is *lame*
    dnotz = None
    for form in [ '%d %b %Y %H:%M:%S', '%d %b %Y %H:%M:%S',
        '%d %b %Y %H:%M', '%d %b %Y %H:%M', '%d %b %y %H:%M:%S',
        '%d %b %y %H:%M:%S', '%d %b %y %H:%M', '%d %b %y %H:%M' ] :
        try:
            dnotz = datetime.strptime(notz, form)
            break
        except:
            continue

    if dnotz is None :
        # print 'Bad Date:',md
        return None

    iso = dnotz.isoformat()

    tz = "+0000"
    try:
        tz = pieces[4]
        ival = int(tz) # Only want numeric timezone values
        if tz == '-0000' : tz = '+0000'
        tzh = tz[:3]
        tzm = tz[3:]
        tz = tzh+":"+tzm
    except:
        pass

    return iso+tz