字符串到datetime返回NaT，即使传递了正确的格式

from datetime import datetime

date_string = "2022-01-01 12:00:00"
format_string = "%Y-%m-%d %H:%M:%S"
datetime_obj = datetime.strptime(date_string, format_string)

from datetime import datetime

date_string = "2022-02-30"
format_string = "%Y-%m-%d"

try:
    datetime_obj = datetime.strptime(date_string, format_string)
except ValueError:
    datetime_obj = None

from datetime import datetime

date_string = "2022-01-01"
format_string = "%Y-%m-%d"

if date_string:
    datetime_obj = datetime.strptime(date_string, format_string)
else:
    datetime_obj = None

from datetime import datetime, timezone

date_string = "2022-01-01 12:00:00"
format_string = "%Y-%m-%d %H:%M:%S"
datetime_obj = datetime.strptime(date_string, format_string).replace(tzinfo=timezone.utc)