test_date_parsing_microseconds.py

import dateutil.parser

dates = [
    # dates that comes as str from kafka message:
    '2019-05-27T12:54:28.777652636Z',
    '2019-05-27T12:54:28.128Z',  # added
    '2019-05-27T12:54:28.120Z',  # added
    '2019-05-27T12:54:28.100Z',  # added
    '2019-05-27T12:54:28.1Z',  # added
    '2019-05-27T12:54:29.993908166Z',
]


def parser_current(dt):
    return int(str(dt.timestamp()).replace('.', ''))


def parser_1(dt):
    return str(int(dt.timestamp())) + dt.strftime('%f')


def parser_2(dt):
    return int(dt.timestamp() * 1000000)


for item in dates:
    print(f'running for "{item}"')
    dt = dateutil.parser.parse(item)
    print(f'parser_current() {parser_current(dt)}')
    print(f'parser_1() {parser_1(dt)}')
    print(f'parser_2() {parser_2(dt)}')

    print('')

output:

running for "2019-05-27T12:54:28.777652636Z"
parser_current() 1558961668777652
parser_1() 1558961668777652
parser_2() 1558961668777652

running for "2019-05-27T12:54:28.128Z"
parser_current() 1558961668128
parser_1() 1558961668128000
parser_2() 1558961668128000

running for "2019-05-27T12:54:28.120Z"
parser_current() 155896166812
parser_1() 1558961668120000
parser_2() 1558961668120000

running for "2019-05-27T12:54:28.100Z"
parser_current() 15589616681
parser_1() 1558961668100000
parser_2() 1558961668100000

running for "2019-05-27T12:54:28.1Z"
parser_current() 15589616681
parser_1() 1558961668100000
parser_2() 1558961668100000

running for "2019-05-27T12:54:29.993908166Z"
parser_current() 1558961669993908
parser_1() 1558961669993908
parser_2() 1558961669993908