In $:/plugins/kookma/shiraz/templates/body/due-date, there is the following macro definition:
\define showCell()
<$set tiddler=<<currentRecord>> field=<<currentColumn>> name=due-date>
<$text text={{{[<due-date>split[-]split[.]join[]format:date[YYYY.0MM.0DD]]}}} />
</$set>
\end
As per my previous guidance referenced by @arunnbabu81, adding [UTC] to the format:date filter operand will correct the problem. Thus:
\define showCell()
<$let fmt="[UTC]YYYY.0MM.0DD">
<$set tiddler=<<currentRecord>> field=<<currentColumn>> name=due-date>
<$text text={{{[<due-date>split[-]split[.]join[]format:date<fmt>]}}} />
</$set>
</$let>
\end
-e