Sorting with custom date format seems wrong
- Dominant language
- JavaScript
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Description
**Describe the bug**
I have a `release-date` field with a custom `date_format` set to `DD-MM-YYYY`, so something like:
```yml
name: 'release-date'
label: 'Release date'
widget: 'datetime'
date_format: 'DD-MM-YYYY'
format: 'DD-MM-YYYY'
```
Then I have `release-date` set under `sortable_fields`, which gets recognized, but doesn't quite work as expected.
**Expected behavior**
I would expect the items to be listed considering the `date_format` and sorted by year first, then month, then day. Not the opposite as it seems to be happening.
**Screenshots**
**Applicable Versions:**
- Netlify CMS version: 2.10.71
- Git provider: GitHub
- OS: macOS 11.0.1
- Browser version: Brave v1.16.76
- Node.JS version: 12.17.0
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