如何在 Java 8 中的 java.util.Date 中获取特定时间

Question

For eg - I want 21:30 as the java.util.Date

Calendar cal = Calendar.getInstance();
cal.set(Calendar.HOUR_OF_DAY,21);
cal.set(Calendar.MINUTE,30);
cal.set(Calendar.SECOND,0);
cal.set(Calendar.MILLISECOND,0);

Date d = cal.getTime();

Is there a better way to do it in Java 8?

I want it in java.util.Date only as I want to pass a Date in endAt() method in Quartz api while building a Trigger.

Answer 1

Conversion of the new java.time classes to java.util.Date usually go through the Instant class. For example, to convert LocalTime 21:30 using today's date and the system time zone you can use:

LocalTime nineThirty = LocalTime.of(21, 30);

Date d = Date.from(Instant.from(nineThirty.atDate(LocalDate.now())
                                          .atZone(ZoneId.systemDefault())))

For Quartz specifically, you may want to use the DateBuilder class from Quartz instead of the legacy Calendar class.

Date d = DateBuilder.todayAt(21, 30, 0);