human
Complete the below
def datestr(then, now=None):

    ''''Converts a (UTC) datetime object to a nice string representation.
    >>> from datetime import datetime, timedelta
    >>> d = datetime(1970, 5, 1)
    >>> datestr(d, now=d)
    \'0 microseconds ago\'
    >>> for t, v in iteritems({
    ...   timedelta(microseconds=1): \'1 microsecond ago\',
    ...   timedelta(microseconds=2): \'2 microseconds ago\',
    ...   -timedelta(microseconds=1): \'1 microsecond from now\',
    ...   -timedelta(microseconds=2): \'2 microseconds from now\',
    ...   timedelta(microseconds=2000): \'2 milliseconds ago\',
    ...   timedelta(seconds=2): \'2 seconds ago\',
    ...   timedelta(seconds=2*60): \'2 minutes ago\',
    ...   timedelta(seconds=2*60*60): \'2 hours ago\',
    ...   timedelta(days=2): \'2 days ago\',
    ...     assert datestr(d, now=d+t) == v
    >>> datestr(datetime(1970, 1, 1), now=d)
    \'January  1\'
    >>> datestr(datetime(1969, 1, 1), now=d)
    \'January  1, 1969\'
    >>> datestr(datetime(1970, 6, 1), now=d)
    \'June  1, 1970\'
    >>> datestr(None)'
    '''

=====
Can you provide a the Python code you requested?
assistant
#Here is the Python code you requested.
    def agohence(n, what, divisor=None):
        if divisor:
            n = (n // divisor)
        out = ((str(abs(n)) + '    ') + what)
        if (abs(n) != 1):
            out += 's'
        out += '    '
        if (n < 0):
            out += 'from    now'
        else:
            out += 'ago'
        return out
    oneday = ((24 * 60) * 60)
    if (not then):
        return ''
    if (not now):
        now = datetime.datetime.utcnow()
    if (type(now).__name__ == 'DateTime'):
        now = datetime.datetime.fromtimestamp(now)
    if (type(then).__name__ == 'DateTime'):
        then = datetime.datetime.fromtimestamp(then)
    elif (type(then).__name__ == 'date'):
        then = datetime.datetime(then.year, then.month, then.day)
    delta = (now - then)
    deltaseconds = int((((delta.days * oneday) + delta.seconds) + (delta.microseconds * 1e-06)))
    deltadays = (abs(deltaseconds) // oneday)
    if (deltaseconds < 0):
        deltadays *= (-1)
    if deltadays:
        if (abs(deltadays) < 4):
            return agohence(deltadays, 'day')
        out = then.strftime('%B    %d').replace('    0', '        ')
        if ((then.year != now.year) or (deltadays < 0)):
            out += (',    %s' % then.year)
        return out
    if int(deltaseconds):
        if (abs(deltaseconds) > (60 * 60)):
            return agohence(deltaseconds, 'hour', (60 * 60))
        elif (abs(deltaseconds) > 60):
            return agohence(deltaseconds, 'minute', 60)
        else:
            return agohence(deltaseconds, 'second')
    deltamicroseconds = delta.microseconds
    if delta.days:
        deltamicroseconds = int((delta.microseconds - 1000000.0))
    if (abs(deltamicroseconds) > 1000):
        return agohence(deltamicroseconds, 'millisecond', 1000)
    return agohence(deltamicroseconds, 'microsecond')