Guaranteed Period End

Key _Guaranteed Period End in Accumulator Days Total Claim refers to the last day of the guaranteed period.
It is calculated by adding the time period specified in key Guaranteed Period to the start date reported in key Guaranteed Period Start
In particular, the calendar entry in key Calendar plays no role here.
Look at Guaranteed Period for details on which trading days are involved in the guaranteed period.

Note this key is prefixed by _, which indicates it is regarded as a read-only part of the object's data and therefore its associated value cannot be edited.
For that reason it does not appear as part of the input data.
It carries informational only value for the user and appears as part of its contents.
Also it completely depends on the remaining object contents and therefore is never part of the exported object's data.