zhaoyongjie opened a new pull request #14945:
URL: https://github.com/apache/superset/pull/14945
### SUMMARY
<!--- Describe the change below, including rationale and design decisions -->
Superset uses the `dateutil.parser` library parses a string to the date
object. The current behavior will use the `now` as the "conversion anchor". for
instance(now is 2017-06-02 CST):
```Python
>>> from dateutil.parser import parse
>>> parse("2017")
datetime.datetime(2017, 6, 2, 0, 0)
```
The new behavior will use the first day of the year(01 Jan) for this
"conversion anchor"
```Python
>>> from datetime import datetime
>>> default = datetime(year=datetime.now().year, month=1, day=1)
>>> parse('2017', default=default)
datetime.datetime(2017, 1, 1, 0, 0)
>>> parse('2017-9', default=default)
datetime.datetime(2017, 9, 1, 0, 0)
```
### BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF
<!--- Skip this if not applicable -->
#### Before
####
#### After
### TESTING INSTRUCTIONS
<!--- Required! What steps can be taken to manually verify the changes? -->
### ADDITIONAL INFORMATION
<!--- Check any relevant boxes with "x" -->
<!--- HINT: Include "Fixes #nnn" if you are fixing an existing issue -->
- [ ] Has associated issue:
- [ ] Changes UI
- [ ] Includes DB Migration (follow approval process in
[SIP-59](https://github.com/apache/superset/issues/13351))
- [ ] Migration is atomic, supports rollback & is backwards-compatible
- [ ] Confirm DB migration upgrade and downgrade tested
- [ ] Runtime estimates and downtime expectations provided
- [ ] Introduces new feature or API
- [ ] Removes existing feature or API
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