How do I compare two dates in Kotlin?

Question

I am creating a Green Pass app and I need some info. I use Kotlin with this code:

val expirationTime = Instant.ofEpochSecond (map [CwtHeaderKeys.EXPIRATION.asCBOR ()]. AsInt64 ())
verificationResult.isNotExpired = expirationTime.isAfter (Instant.now ())

I should check between the certificate date and today's date, if it exceeds 45 days it opens a new activity for me.

Couldn't you just calculate the difference of your dates and check if the difference is greater than 3.888.000 (45 days in seconds) and if it is greater open the new activity. — bluejambo
– bluejambo, Commented Aug 5, 2021 at 10:52

Tom · Accepted Answer · 2021-08-05 11:27:17Z

1

You can use java.time.temporal.ChronoUnit

Example to find number of days between two dates:

ChronoUnit.DAYS.between(date1, date2)

You can use the same mechanisem for other time units:

ChronoUnit.MONTHS.between(date1, date2)

Get the result and check if its greater then 45.

edited Aug 5, 2021 at 11:27

answered Aug 5, 2021 at 11:14

Tom

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Comments

Nikolai Shevchenko · Accepted Answer · 2021-08-05 12:39:04Z

1

You can use java.time.Duration

val days = Duration.between(expirationTime, Instant.now()).toDays()
if (days > 45) {
   // your actions
}

edited Aug 5, 2021 at 12:39

answered Aug 5, 2021 at 11:14

Nikolai Shevchenko

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4 Comments

Nikolai Shevchenko Over a year ago

@GiuseppeEDP yes

Giuseppe EDP Over a year ago

Ok, i have a problem. If i put code on DefaultCborService not import element i.imgur.com/WyW4Fnk.png

Nikolai Shevchenko Over a year ago

@GiuseppeEDP i didn't understand anything from your picture. Try putting a better example in your original Question

Giuseppe EDP Over a year ago

I would need a popup warning me when the date exceeds 45 days, the code is this: val issuedAt = Instant.ofEpochSecond(map[CwtHeaderKeys.ISSUED_AT.asCBOR()].AsInt64()) verificationResult.isIssuedTimeCorrect = issuedAt.isBefore(Instant.now())

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