When you need to format a Date as a String you using the same Java patterns as for the DateTimeFormatterBuilder

For example, let's say we want the output in the format yyyy-MM-dd’T’HH:mm:ss.SSS 

Date Time conversion examples in Mule 4 Dataweave 2.0



Dataweave Code:
%dw 2.0
output application/json
fun format(d: DateTime) = d as String {format: "yyyy-MM-dd'T'HH:mm:ss.SSS"}
---
{
CreatedDateTime: format(|2019-02-13T13:23:00.120Z| >> "CET"),
}

Result:
{
"CreatedDateTime": "2019-02-13T14:23:00.120"
} 

Examples: 
%dw 2.0
output application/json
var utc = "UTC" as TimeZone
fun printFormattedDate()=(now() >> utc) as String
---
{
myDate: printFormattedDate()
}

Result:
{
"myDate": "2019-09-15T23:08:56.367Z"
}

Others:
"Date of Birth" : ($."DOB" as :date) as :string {format: "yyyy-MM-dd HH:mm:ss"}


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