The user would like to set certain time periods to Missing when working with a Date/Time variable.
For example, he wants to use a variable in the crosstab but doesn’t want 2020 to appear as it has no data.
This way, he could also sig test 2021 to 2019 - the previous period with data.
Workaround: change var to Nominal, but then the sig testing functionality isn’t the same: