Hi,
1) If you are trying to change date format in Email Design :
You can change your date format by using Format expression.
Use below in your HTML code:
data-nl-format="%4Y-%2M-%2D %2h:%2n:%2s"
Something like this:
<p >Booking Date:<span data-nl-type="datetime" data-nl-format="%4Y-%2M-%2D %2h:%2n:%2s">Booking Date </span></p>
2) If you are trying to change date format in a workflow, you can use below code:
const FORMAT_120 ="%4Y-%2M-%2D %2h:%2n:%2s"
instance.vars.workflowExecutionInitiatedAt=formatDate(date,FORMAT_120);
Thanks