Date Shifter - how to pass a negative day shift in a flow variable?

Hi all,

how can I pass a negative day shift (e.g. minus 2 days) by a flow variable into the date shifter node?

I tried -2d or -(2d) or -(2 days) but always got parsing errors. However positive shifts (e.g. 2d, 5d, …) worked fine.

We are using KNIME version 5.5.1.

Thanks in advance for any ideas