In order to update date ranges within a Specific Dates timeframe, include the parameter update_only and provide within the array timeframe-specific-dates-array the new values for the date ranges you intend to update, including in each date range the associated timeframe-id for that range. If any date ranges are missing the timeframe-id parameter, it may result in undesired behavior.

The value for update-only must be set to yes for this operation to succeed as desired. If any other value is supplied or the parameter update-only is omitted, it will result in the behavior described in "Replace All Date Ranges in Specific Dates Timeframe" - see examples for more information.