Yes, SearchBlox does support date-range-based searching.
The syntax for the date range functionality is as shown below:
where startdate is the start date, enddate is the end date and startdate < enddate.
The format for the startdate and enddate is YYYYMMDDHHMMSS where
YYYY is the year (example: 2007)
MM is the month (01 to 12)
DD is the day (01 to 31)
HH is the hour (00 to 23)
MM is the minute (00 to 59)
SS is the second (00 to 59)
The startdate and enddate search parameters can be used with other available search parameters.