Fix tzaware dates mismatch but no exception raised
State: closed

- [x] closes #18431
- [x] tests added / passed
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [x] whatsnew entry


Labels:
name: Datetime
description: Datetime data dtype
name: Error Reporting
description: Incorrect or improved errors from pandas
name: Timezones
description: Timezone data dtype

Comments:
# [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/18488?src=pr&el=h1) Report
> Merging [#18488](https://codecov.io/gh/pandas-dev/pandas/pull/18488?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/be66ef832ef551d118a8e219a9e98928681df835?src=pr&el=desc) will **decrease** coverage by `0.01%`.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/18488/graphs/tree.svg?width=650&src=pr&token=eZ4WkYLtcO&height=150)](https://codecov.io/gh/pandas-dev/pandas/pull/18488?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master   #18488      +/-   ##
==========================================
- Coverage   91.33%   91.32%   -0.02%     
==========================================
  Files         163      163              
  Lines       49752    49752              
==========================================
- Hits        45443    45436       -7     
- Misses       4309     4316       +7
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `89.12% <ø> (ø)` | :arrow_up: |
| #single | `40.71% <ø> (-0.07%)` | :arrow_down: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/18488?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/io/gbq.py](https://codecov.io/gh/pandas-dev/pandas/pull/18488?src=pr&el=tree#diff-cGFuZGFzL2lvL2dicS5weQ==) | `25% <0%> (-58.34%)` | :arrow_down: |
| [pandas/core/frame.py](https://codecov.io/gh/pandas-dev/pandas/pull/18488?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvZnJhbWUucHk=) | `97.8% <0%> (-0.1%)` | :arrow_down: |
| [pandas/core/indexes/datetimes.py](https://codecov.io/gh/pandas-dev/pandas/pull/18488?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvaW5kZXhlcy9kYXRldGltZXMucHk=) | `95.71% <0%> (+0.19%)` | :arrow_up: |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/18488?src=pr&el=continue).
> **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta)
> `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
> Powered by [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/18488?src=pr&el=footer). Last update [be66ef8...925fede](https://codecov.io/gh/pandas-dev/pandas/pull/18488?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).

# [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/18488?src=pr&el=h1) Report
> Merging [#18488](https://codecov.io/gh/pandas-dev/pandas/pull/18488?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/be66ef832ef551d118a8e219a9e98928681df835?src=pr&el=desc) will **decrease** coverage by `2.2%`.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/18488/graphs/tree.svg?width=650&height=150&src=pr&token=eZ4WkYLtcO)](https://codecov.io/gh/pandas-dev/pandas/pull/18488?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master   #18488      +/-   ##
==========================================
- Coverage   91.33%   89.13%   -2.21%     
==========================================
  Files         163      163              
  Lines       49752    49781      +29     
==========================================
- Hits        45443    44370    -1073     
- Misses       4309     5411    +1102
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `89.13% <ø> (+0.01%)` | :arrow_up: |
| #single | `?` | |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/18488?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/io/gbq.py](https://codecov.io/gh/pandas-dev/pandas/pull/18488?src=pr&el=tree#diff-cGFuZGFzL2lvL2dicS5weQ==) | `25% <0%> (-58.34%)` | :arrow_down: |
| [pandas/io/sql.py](https://codecov.io/gh/pandas-dev/pandas/pull/18488?src=pr&el=tree#diff-cGFuZGFzL2lvL3NxbC5weQ==) | `46.66% <0%> (-48.14%)` | :arrow_down: |
| [pandas/core/computation/pytables.py](https://codecov.io/gh/pandas-dev/pandas/pull/18488?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvY29tcHV0YXRpb24vcHl0YWJsZXMucHk=) | `62.5% <0%> (-29.88%)` | :arrow_down: |
| [pandas/io/pytables.py](https://codecov.io/gh/pandas-dev/pandas/pull/18488?src=pr&el=tree#diff-cGFuZGFzL2lvL3B5dGFibGVzLnB5) | `64.37% <0%> (-28.47%)` | :arrow_down: |
| [pandas/io/feather\_format.py](https://codecov.io/gh/pandas-dev/pandas/pull/18488?src=pr&el=tree#diff-cGFuZGFzL2lvL2ZlYXRoZXJfZm9ybWF0LnB5) | `71.42% <0%> (-14.29%)` | :arrow_down: |
| [pandas/core/computation/common.py](https://codecov.io/gh/pandas-dev/pandas/pull/18488?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvY29tcHV0YXRpb24vY29tbW9uLnB5) | `78.57% <0%> (-7.15%)` | :arrow_down: |
| [pandas/core/computation/expr.py](https://codecov.io/gh/pandas-dev/pandas/pull/18488?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvY29tcHV0YXRpb24vZXhwci5weQ==) | `84.27% <0%> (-4.39%)` | :arrow_down: |
| [pandas/io/formats/console.py](https://codecov.io/gh/pandas-dev/pandas/pull/18488?src=pr&el=tree#diff-cGFuZGFzL2lvL2Zvcm1hdHMvY29uc29sZS5weQ==) | `66.66% <0%> (-3.04%)` | :arrow_down: |
| [pandas/io/clipboard/clipboards.py](https://codecov.io/gh/pandas-dev/pandas/pull/18488?src=pr&el=tree#diff-cGFuZGFzL2lvL2NsaXBib2FyZC9jbGlwYm9hcmRzLnB5) | `29.88% <0%> (-2.3%)` | :arrow_down: |
| [pandas/io/formats/printing.py](https://codecov.io/gh/pandas-dev/pandas/pull/18488?src=pr&el=tree#diff-cGFuZGFzL2lvL2Zvcm1hdHMvcHJpbnRpbmcucHk=) | `87.61% <0%> (-1.77%)` | :arrow_down: |
| ... and [6 more](https://codecov.io/gh/pandas-dev/pandas/pull/18488?src=pr&el=tree-more) | |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/18488?src=pr&el=continue).
> **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta)
> `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
> Powered by [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/18488?src=pr&el=footer). Last update [be66ef8...685b861](https://codecov.io/gh/pandas-dev/pandas/pull/18488?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).

Updated tests
Gotcha, using parametrize now
lgtm. ping on green.
@jreback all green :)
thanks @aschade