ENH: DatetimeProperties results seem to be inconsistent since missing milliseconds #49073
- [ X] closes #49073 (Replace xxxx with the GitHub issue number)
- [ X] [Tests added and passed](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#writing-tests) if fixing a bug or adding a new feature
- [ X] All [code checks passed](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#pre-commit).

I have added the millisecond feature to the Datetime function on Pandas. As it was discussed in the issue, it seemed inconsistent. However, I didn't change how the microseconds were being exhibited (with 6 digits instead of 3), not to break the code.

closing as per https://github.com/pandas-dev/pandas/issues/49073#issuecomment-1323967551 , but thanks for your PR!