Periodically companies change their fiscal-year end-dates. This leads to strangeness when analysts attempt to construct time-series of financials. Calcbench makes an effort to handle these changes.
Some cases are simple, for instance when a company changes their fiscal-year end-date from December 31st to June 30th Calcbench adjusts year end to June 30th. The period end date for calendar year 2017 will be June 30th.