BUG: set tz on DTI from fixed format HDFStore
State: closed

Set the tz after creating the DatetimeIndex instance when reading from a fixed
format HDFStore. Setting the tz during instance creation offset data.

closes #17618

- [x] closes #xxxx
- [x] tests added / passed
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [x] whatsnew entry


Labels:
name: Bug
name: IO HDF5
description: read_hdf, HDFStore
name: Timezones
description: Timezone data dtype

Comments:
# [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/17844?src=pr&el=h1) Report
> Merging [#17844](https://codecov.io/gh/pandas-dev/pandas/pull/17844?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/727ea20bdb72ff4a5b8380d7f613d4aff058e28a?src=pr&el=desc) will **increase** coverage by `<.01%`.
> The diff coverage is `100%`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/17844/graphs/tree.svg?token=eZ4WkYLtcO&src=pr&width=650&height=150)](https://codecov.io/gh/pandas-dev/pandas/pull/17844?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master   #17844      +/-   ##
==========================================
+ Coverage   91.22%   91.23%   +<.01%     
==========================================
  Files         163      163              
  Lines       50014    50014              
==========================================
+ Hits        45627    45630       +3     
+ Misses       4387     4384       -3
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `89.04% <100%> (+0.02%)` | :arrow_up: |
| #single | `40.25% <100%> (-0.05%)` | :arrow_down: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/17844?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/io/pytables.py](https://codecov.io/gh/pandas-dev/pandas/pull/17844?src=pr&el=tree#diff-cGFuZGFzL2lvL3B5dGFibGVzLnB5) | `92.79% <100%> (ø)` | :arrow_up: |
| [pandas/io/gbq.py](https://codecov.io/gh/pandas-dev/pandas/pull/17844?src=pr&el=tree#diff-cGFuZGFzL2lvL2dicS5weQ==) | `25% <0%> (-58.34%)` | :arrow_down: |
| [pandas/core/frame.py](https://codecov.io/gh/pandas-dev/pandas/pull/17844?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvZnJhbWUucHk=) | `97.77% <0%> (-0.1%)` | :arrow_down: |
| [pandas/plotting/\_converter.py](https://codecov.io/gh/pandas-dev/pandas/pull/17844?src=pr&el=tree#diff-cGFuZGFzL3Bsb3R0aW5nL19jb252ZXJ0ZXIucHk=) | `65.2% <0%> (+1.81%)` | :arrow_up: |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/17844?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/17844?src=pr&el=footer). Last update [727ea20...e92349e](https://codecov.io/gh/pandas-dev/pandas/pull/17844?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/17844?src=pr&el=h1) Report
> Merging [#17844](https://codecov.io/gh/pandas-dev/pandas/pull/17844?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/727ea20bdb72ff4a5b8380d7f613d4aff058e28a?src=pr&el=desc) will **increase** coverage by `<.01%`.
> The diff coverage is `100%`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/17844/graphs/tree.svg?height=150&token=eZ4WkYLtcO&width=650&src=pr)](https://codecov.io/gh/pandas-dev/pandas/pull/17844?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master   #17844      +/-   ##
==========================================
+ Coverage   91.22%   91.23%   +<.01%     
==========================================
  Files         163      163              
  Lines       50014    50014              
==========================================
+ Hits        45627    45630       +3     
+ Misses       4387     4384       -3
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `89.04% <100%> (+0.02%)` | :arrow_up: |
| #single | `40.25% <100%> (-0.05%)` | :arrow_down: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/17844?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/io/pytables.py](https://codecov.io/gh/pandas-dev/pandas/pull/17844?src=pr&el=tree#diff-cGFuZGFzL2lvL3B5dGFibGVzLnB5) | `92.79% <100%> (ø)` | :arrow_up: |
| [pandas/io/gbq.py](https://codecov.io/gh/pandas-dev/pandas/pull/17844?src=pr&el=tree#diff-cGFuZGFzL2lvL2dicS5weQ==) | `25% <0%> (-58.34%)` | :arrow_down: |
| [pandas/core/frame.py](https://codecov.io/gh/pandas-dev/pandas/pull/17844?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvZnJhbWUucHk=) | `97.77% <0%> (-0.1%)` | :arrow_down: |
| [pandas/plotting/\_converter.py](https://codecov.io/gh/pandas-dev/pandas/pull/17844?src=pr&el=tree#diff-cGFuZGFzL3Bsb3R0aW5nL19jb252ZXJ0ZXIucHk=) | `65.2% <0%> (+1.81%)` | :arrow_up: |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/17844?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/17844?src=pr&el=footer). Last update [727ea20...e92349e](https://codecov.io/gh/pandas-dev/pandas/pull/17844?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).

thanks!