$_field : string
The name of the field that should be restricted.
This class provides a date query filter
A filter will restrict any query for a given field, showing only results matching the filter. In essence, this is a limited version of the range query facility supported by Lucene.
__construct(string $field, integer $start, integer $end)
Create a new date filter.
Only one of the filter bounds may be 0, indicating no limit in that direction.
The name of the field that should be filtered.
Start of filter range (or 0 for no start filter)
End of filter range (or 0 for no end filter)