Plotting a Datetime Measure - Value Format Datetime to Time on chart

Hey,

I have a measure of date time which I would like to format as a time within a chart.

Here you see my measure 🙂

From what I understand I should be able to use “%H:%M:%S” to return only HH:MM:SS of my date-time measure, however when I try this I receive the below message:

'Invalid Format String

Format strings follow standard spreadsheet format using ECMA-376 spreadsheet format codes.’

Any pointers?

Cheers

Will