change the time interval in spring app using the code-CodePudding

I have a spring boot applicate that is using many types of date objects it like:

java.util.Date
java.time.LocalDate
java.time.Instant

I have a sandbox environment, I want to do some tests on it, but in tests, I need time to be changed by shifting the current_time by one year, in other words, I want to interval the time by 1 year.

example: let's suppose the date now is 7/feb/2022 if I called any date function, I need it to return 7/feb/2023,

I want to change the date just in the spring app, I don't want to change the whole server time.

Is this doable in spring app for any of the previous date objects?

update: I am using code like this in all my app

LocalDate localDate = LocalDate.now();
Date date = new Date()

I don't want to change the code in all my app (line by line)

I am looking at changing the date by adding some configurations, not by changing the existing code.

CodePudding user response：

For java.time classes, you can pass an optional Clock argument. The Clock class offers several static method returning alerted clock behavior. One of those supports a fixed moment, that does not increment.

Set up your altered clock.

ZoneId zoneId = ZoneId.of( "Africa/Tunis" ) ;
LocalDate aYearFromToday = LocalDate.now( zoneId ).plusYears( 1 ) ;
ZonedDateTime zdt = aYearFromToday.atStartOfDay( zoneId ) ;
Instant instant = zdt.toInstant() ; 
Clock fixedClock = Clock.fixed( instant , zoneId ) ;

Usage.

Instant nowFake = Instant.now( fixedClock ) ;
LocalDate todayFake = LocalDate.now( fixedClock ) ;

CodePudding user response：

Most of these java objects work well with each other. I'm assuming you are storing the server time in one of these classes. There is a simple function to add a year in LocalDate. Here is what I would do to get one year after the given server time.

LocalDate serverDate = LocalDate.of(2022, 2, 7);
System.out.println(serverDate);

LocalDate newTestDate = serverDate.plusYears(1);
System.out.println(newTestDate);


2022-02-07
2023-02-07

Most of these date objects can convert into the other object with a simple function. Hope this answers your question!