How should I format and parse a DateTimeFormatter object?

Question

I am trying to parse a date in parseServerTimeOffsetDateTime(), but I keep getting errors. Can't seem to make it work.

Here is what I have done so far:

1. For some reason the function keeps returning a Unit data type or TemporalAccessor if I try to parse the function with default parse function. I tried converting it into a String or DataTimeFormatter and similar data types but in those cases it shows errors in try/catch block like a type missmatch and it won't compile.

2. I checked in documentation but am still unclear what TemporalAccessor is.

3. I thought of writing my own parser TimeParser, but I am not sure how I should implement it. Since the format of the date is 2022-05-24T07:52:03Z I thought of putting 'T' and 'Z' as a character where it should be parsed.

private val serverTimeFormatterOffsetDateTimeFormatter =
    DateTimeFormatter.ISO_ZONED_DATE_TIME 

private val fallbackServerTimeFormatterOffsetDateTime =
    DateTimeFormatter.ISO_ZONED_DATE_TIME

fun OffsetDateTime.toServerDateFormatOffsetDateTime() = DateTimeFormatter.ofPattern("yyyy-MM-dd")

fun OffsetDateTime.toServerTimeFormatOffsetDateTime() =
    serverTimeFormatterOffsetDateTimeFormatter.format(this)

fun String.parseServerTimeOffsetDateTime() = try {
    serverTimeFormatterOffsetDateTimeFormatter.TimeParser(this)
} catch (pe: ParseException) {
    fallbackServerTimeFormatterOffsetDateTime.TimeParser(this)
}

fun DateTimeFormatter.TimeParser(time: String) {
//    Haven't done anything yet here
    val delimeter = "T"
    val delimeter2 = "Z"
    //  code for parsing
}

How should I format and parse a DateTimeFormatter object?