GitHub user dosubot[bot] added a comment to the discussion: Date Filter
<!-- Answer -->
To make the custom date filter range inclusive of the end date, edit
superset/utils/date_parser.py in the get_since_until function. Right after the
line where _since and _until are set for custom ranges (after _since, _until =
map(datetime_eval, since_and_until)), add one day to _until. Here’s how you can
do it:
Find this block (around line 467):
```python
_since, _until = map(datetime_eval, since_and_until)
```
Immediately after, insert:
```python
from datetime import timedelta
# Make custom range end date inclusive by adding one day
if _until is not None:
_until = _until + timedelta(days=1)
```
This ensures that, for custom ranges, the filter will include the
user-specified end date for day-level granularity. If you need finer control
(e.g., for timestamp-level), you may want to adjust the timedelta accordingly.
Be sure to test this change, as it may affect how date filters behave elsewhere
in your dashboards.
Reference: [superset/utils/date_parser.py get_since_until
function](https://github.com/apache/superset/blob/829e4d92d91ceae4b43b1ed3b063ffe45377799c/superset/utils/date_parser.py#L314-L529)
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GitHub link:
https://github.com/apache/superset/discussions/37192#discussioncomment-15515258
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