In order to keep the database clear of expired needs, we do require an end date for each need posted. Otherwise, organizations could post needs for an indefinite period. Many times needs change and administrators may forget to update those needs, so all needs must have an expiration dates, at which time it will stop appearing in search results.
Because needs with nearer-term shifts and expiration dates appear first in search results, we suggest posting needs more frequently (or adjusting expiration dates on a regular basis) rather than giving them expiration dates in the distant future.