Hi everyone! How do I make `java.text.SimpleDateFo...

# announcements

[iex]

Hi everyone! How do I make java.text.SimpleDateFormat fail if the date string doesn't match exactly? Tried setting isLenient to false but it didn't work. Specifically I want that if the format is "yyyy-MM-dd", e.g. "2019-08-05T235959+0200" is NOT parsed. it should only parse if the date string is "2019-08-05"

val str = "2019-08-05T23:59:59+0200"
val format = SimpleDateFormat("yyyy-MM-dd")
format.isLenient = false
format.parse(str) // should return null or crash

[df]

In your case LocalDate.parse() should be sufficient

[diesieben07]

Any reason you are not using DateTimeFormatter from java.time?

[diesieben07]

For SimpleDateFormat you can use ParsePosition to detect extraneous text at the end:

val position = ParsePosition(0)
val input = "2019-08-05T23:59:59+0200"
val parsed = format.parse(input, position)
if (position.index != input.length) {
    throw Exception("Invalid Date")
}

[iex]

I'm not using java.time because I'm using the Android SDK

[iex]

Not sure about LocalDate.parse()? Haven't seen this

[diesieben07]

LocalDate is also part of java.time.

[iex]

ParsePosition seems usable 👍

[iex]

ah, okay. Then I can't use LocalDate either

[iex]

thx

[diesieben07]

There is this: https://www.threeten.org/threetenbp/

[diesieben07]

But not sure if its possible for you to use that. But if at all possible you should avoid the pre java.time Time apis like the plague

[diesieben07]

They are ridiculously hard to use correctly.

[iex]

ah good to know, thanks!