I am completly fine if the value was 2019-53 And the next week in the viewer to be 2020-02, omitting 2020-01. This is the closest way as it is calculated in Google Docs: =WEEKNUM("30.12.2019") =WEEKNUM("06.01.2020") or in MS Excel
The first week of year 2020 is shown as 2019-1 in the viewer "Effort" in mode "Effort per week"
Crash on Close in WinXP