{
  "title": "string for dateFrom and dateTo as search filter",
  "$schema": "http://json-schema.org/draft-04/schema#",
  "description": "0 or [number][dwMy] (where dwMy unit for day, week, etc) or ISO date in YYYY-MM-DD format",
  "type": "string",
  "pattern": "^([+-]?0|([+-]?[0-9]+[dwMy])+|\\d{4}-\\d{2}-\\d{2})$"
}