datetime module has no support for nanoseconds

GitHub fields:

assignee = 'https://github.com/abalkin'
closed_at = None
created_at = <Date 2012-07-24.19:36:50.070>
labels = ['type-feature', 'library', '3.10']
title = 'datetime module has no support for nanoseconds'
updated_at = <Date 2021-12-18.16:09:10.349>
user = 'https://bugs.python.org/goshawk'

bugs.python.org fields:

activity = <Date 2021-12-18.16:09:10.349>
actor = 'gdr@garethrees.org'
assignee = 'belopolsky'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2012-07-24.19:36:50.070>
creator = 'goshawk'
dependencies = []
files = ['37509', '37512']
hgrepos = []
issue_num = 15443
keywords = ['patch']
message_count = 61.0
messages = ['166326', '166331', '166333', '166335', '166336', '166338', '166340', '166345', '166361', '166364', '166383', '166385', '166386', '166387', '166414', '180125', '223039', '223042', '223066', '223068', '223071', '223073', '223074', '223075', '223077', '223078', '223080', '223082', '223083', '223106', '224360', '232952', '232962', '237338', '237807', '237809', '237819', '240243', '240244', '240290', '240291', '240292', '240294', '240299', '240398', '270266', '270535', '270885', '270886', '270887', '270888', '276748', '276749', '390474', '390479', '390483', '390486', '390491', '392382', '392418', '408859']
nosy_count = 21.0
nosy_names = ['lemburg', 'tim.peters', 'mark.dickinson', 'belopolsky', 'giampaolo.rodola', 'pythonhacker', 'Arfrever', 'r.david.murray', 'andrewclegg', 'python-dev', 'gdr@garethrees.org', 'Ramchandra Apte', 'Eli_B', 'serhiy.storchaka', 'goshawk', 'Niklas.Claesson', 'mdcb808@gmail.com', 'scoobydoo', 'tomikyos', 'p-ganssle', 'anglister']
pr_nums = ['21987']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue15443'
versions = ['Python 3.10']