The current date may have daylights savings or not. This will cause the
test to fail if daylight savings is in effect. Hence getting the offset
based on the given date instead.

Fixes
[AB#555940](https://dynamicssmb2.visualstudio.com/1fcb79e7-ab07-432a-a3c6-6cf5a88ba4a5/_workitems/edit/555940)