Duration using DB folder formulas.

[to4711]

Hello,

I want to get a duration from a start time column named startTime and an end time column named endTime. The times in these columns are strings in the format "HH:mm". For this I want to use the Luxon library. In order to do so I tried something like:

${
luxon.DateTime.fromFormat(this.endTime, "HH:mm").diff(luxon.DateTime.fromFormat(this.startTime, "HH:mm"), ["hours", "minutes"]).toFormat("hh:mm") }

But because this does not work and I am totally unable to get it to work I need your help!

Thank you all in advance!