如何知道kotlin中字符串日期的模式

Question

I want to convert in ZonedDateTime . How can I recognise pattern to pass in DateTimeFormatter.ofPattern(????????) .

val string = "May 9, 2020 8:09:03 PM"

private fun getFormatDate(date: String): ZonedDateTime {
     val dateTimeFormatter = DateTimeFormatter.ofPattern(????????)
     return ZonedDateTime.parse(date, dateTimeFormatter)
}

Many Thanks

Answer 1

You can do:

private fun getFormatDate(date: String): ZonedDateTime {
    val dateTimeFormatter =
        DateTimeFormatter
            .ofPattern("MMM d, yyyy h:mm:ss a")
            .withZone(ZoneId.systemDefault()) // or some other zone that you would like to use
            .withLocale(Locale.ENGLISH)
    return ZonedDateTime.parse(date, dateTimeFormatter)
}

Note that it is important that you do .withZone which specifies the zone that the ZonedDateTime is going to have, and also .withLocale , so that the parser interprets things like "May" and "PM" in the correct language.

Try It Online

See all the pattern letters here