code: func (b *FilterQueryBuilder) AddDateRangeFilter(timeField, lte, gte, format string) *FilterQueryBuilder {
  	b.filters = append(b.filters, &RangeFilter{
  		Key:    timeField,
  		Lte:    lte,
  		Gte:    gte,
  		Format: format,
  	})
  	return b
  }
docs: // AddDateRangeFilter adds a new time range filter