Mulesoft Dataweave zero zoned timestamp conversion

Question

I am looking to convert a Datetime field into ZonedDatetime but with Zero timestamp. I have a function like below -

fun dateInSecToDateTimePST(d : String) = if (d != null)
                            (d as Number as DateTime {unit: "seconds"} >> "CST")
                        else null

The output of this is

2020-11-20T21:30:00-06:00

But The output what I am expecting is like below-

2020-11-20T00:00:00-06:00

Timestamp will always remain zero but with offset. Any suggestion ? I am using %dw 2.0 and Mule4

Answer 1

With the date time types you can breakup the datetime input and concat it back together with the zeroed time piece like this:

%dw 2.0
output application/json
fun dateInSecToDateTimePST(d : String) = do { 
    var date = (d as Number as DateTime {unit: "seconds"}) as Date
    var time = "00:00:00" as Time
    var zone = "CST" as TimeZone
    ---
    if (d != null)
        date ++ time ++ zone
    else null
}
---
dateInSecToDateTimePST(payload.time)

you could also have the timezone be dynamic as well if needed.