CODEWITHSUNDEEP
javarestlocalizationinternationalizationjersey-2.0
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Reputation: 2923

java: TimeZone in rest api

In my jersey rest api when a user sends a POST request

{
   "user":"john",
   "question":"what was temperature an hour ago"
}

a QuestionProcessor transforms the String an hour ago into LocalDateTime.now(ZoneId.of(UTC)).minusHours(5).format(dateformatter);

I want to replace the UTC default by the users timezone. How can I do that?

Thanks for the help

Upvotes: 1

Views: 1435

Answers (1)

Basil Bourque
Basil Bourque

Reputation: 339502

You asked:

replace the UTC default by the users timezone

Easy:

ZoneId z = ZoneId.of( "Africa/Tunis" ) ;
ZonedDateTime now = ZonedDateTime.now( z ) ;
ZonedDateTime then = now.minusHours( 1 ) ;

The catch: You must know the user’s time zone name such as Africa/Tunis, Europe/Paris, Asia/Kolkata, Pacific/Auckland, or America/Montreal.

You need to reformulate your REST API to also pass a field for time zone name.

Specify a proper time zone name in the format of Continent/Region, such as examples seen above. Never use the 2-4 letter abbreviation such as EST or IST as they are not true time zones, not standardized, and not even unique(!).

By the way, I cannot imagine when calling LocalDateTime.now is the right thing to do. That class cannot represent a moment as it purposely lacks the context of an offset-from-UTC or time zone. Use Instant, OffsetDateTime, or ZonedDateTime instead.

Table of date-time types in Java, both modern and legacy

Upvotes: 4

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