Java : Date String to Hours

Question

i have this Date String 2020-07-26T20:08:27Z i want to perform date comparison.

so is there any framework/util for this operation.

String s1 = "2020-07-26T20:08:27Z";
String s2 = "2020-07-26T21:08:27Z";

in the above sample code, i want to find the bigger date

Use LocalDateTime https://www.baeldung.com/java-8-date-time-intro — mtricht, Jul 26 '20 at 20:37
@swordbeta No, not `LocalDateTime` here. Notice the `Z` on the end. This means UTC. So `Instant` or `OffsetDateTime` classes apply. — Basil Bourque, Jul 26 '20 at 21:51
[I downvoted because research must be done to ask a good question](http://idownvotedbecau.se/noresearch/). — Ole V.V., Jul 27 '20 at 00:18

Basil Bourque · Accepted Answer · 2020-07-26T21:54:42.063

tl;dr

Instant
.parse( "2020-07-26T20:08:27Z" ) 
.isBefore(
    Instant.parse( "2020-07-26T21:08:27Z" )
)

true

java.time

Use the modern java.time classes built into Java 8 and later.

ISO 8601

The Z on the end of your input indicates an offset-from-UTC of zero hours-minutes-seconds, or UTC itself. The Z is pronounced “Zulu”.

Your input strings are in standard ISO 8601 format. The java.time classes use these formats by default when parsing/generating strings. So no need to specify a formatting pattern.

`Instant`

An Instant object represents a moment in UTC.

Instant instantA = Instant.parse( "2020-07-26T20:08:27Z" ) ;
Instant instantB = Instant.parse( "2020-07-26T21:08:27Z" ) ;

Compare using equals, isBefore, isAfter.

boolean aBeforeB = instantA.isBefore( instantB ) ;

`Duration`

You can capture the time elapsed between the two moments as a Duration object.

Duration d = Duration.between( instantA , instantB ) ;

You can ask the Duration object if it is zero or negative.

Java : Date String to Hours

1 Answers1

tl;dr

java.time

ISO 8601

Instant

Duration

`Instant`

`Duration`