DateTime Conversion (openHAB 3.x)

Tutorials & Examples
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177

I have just upgraded from OpenHab 2 and I want to simply format the current time as a string (such as 22-May 22:49)

I had the following code in a rule and this now outputs a long unformatted timestring

    val timestamp = now.toString("dd-MMM HH:mm")
    logInfo("log.rules", timestamp)

I have tried many things, such as #11 and variations on SimpleDateFormat, but to no avail…
I must be missing something trivial as this cannot be too difficult…

EDIT:
The following works, but is there a simpler solution (without an import)?

import java.time.format.DateTimeFormatter

    ...
    val timestamp = now.format(DateTimeFormatter.ofPattern("dd-MMM HH:mm"))
    logInfo("log.rules", timestamp)
    ...