put https://{server}/ns-api/v2/domains//timeframes/#7
It is possible to convert a timeframe from one type to another, e.g. from Holiday to Specific Dates or from Days of Week to Custom.
It is not possible to convert a Custom timeframe to any other type.
Converting Specific Dates, Days of Week, or Holiday to Custom will result in a Custom timeframe which contains any entries which existed in the time frame before conversion.
Converting Always to Custom will result in an empty Custom timeframe to which desired entries can then be added.
Converting between any non-Custom types will result in losing those entries (for instance, converting Specific Dates to Days of Week will delete any date ranges in the timeframe)