如何获得30分钟的返回实例对象（Instance.now（）-30分钟）

Question

private Instant submissionDate = Instant.now();


void scheduleResult() {
    if(submissionDate befor 30 min)
            execute;
}

如果submisisionDate早于30分钟，如何执行调度程序任务。

Answer 1

使用Instant#minus(30, ChronoUnit.MINUTES)

Instant submissionDate = ...

Instant now = Instant.now(); 
Instant thirtyMinutesBeforeNow = now.minus(30, ChronoUnit.MINUTES);

if (submissionDate.isBefore(thirtyMinutesBeforeNow)) {

}

或Instant#minusSeconds(1800)

Instant submissionDate = ...

Instant now = Instant.now(); 
Instant thirtyMinutesBeforeNow = now.minusSeconds(1800);

if (submissionDate.isBefore(thirtyMinutesBeforeNow)) {

}

Answer 2

您可以在过去的日期中激活30分钟：

LocalDateTime halfHourInPast = LocalDateTime.now().minusMinutes(30);

并使用它来比较您的日期：

LocalDateTime submissionDate = LocalDateTime.ofInstant(submissionDateInstant, ZoneOffset.UTC);
if(submissionDate.isBefore(halfHourInPast)){
   //schedule
}

Answer 3

if ( submissionDate.isBefore(Instant.now().minus(30, ChronoUnit.MINUTES))){
//                      run
}