{
  "title": "string for dateFrom and dateTo as search filter",
  "$schema": "http://json-schema.org/draft-04/schema#",
  "description": "0 or [number][smhdwMy] (where smhdwMy unit for second, minute, etc) or ISO 8601 timestamp",
  "type": "string",
  "pattern": "^([+-]?0|([+-]?[0-9]+[smhdwMy])+|\\d{4}-\\d{2}-\\d{2}T\\d{2}:\\d{2}:\\d{2}([,.]\\d{1,3})?)(Z|[+-]\\d{2}(:?\\d{2})?)?$"
}