我认为这已经被问过了,但我找不到anything。如何确定ZonedDateTime是否为“今天”?
使用java.time
确定给定的ZonedDateTime
是否为“今天”的最佳方法是什么?
我已经想出了至少两种可能的解决方案。我不确定这些方法是否存在漏洞或陷阱。基本想法是让java.time
数字出来,并没有做任何的数学自己:
/**
* @param zonedDateTime a zoned date time to compare with "now".
* @return true if zonedDateTime is "today".
* Where today is defined as year, month, and day of month being equal.
*/
public static boolean isZonedDateTimeToday1(ZonedDateTime zonedDateTime) {
ZonedDateTime now = ZonedDateTime.now();
return now.getYear() == zonedDateTime.getYear()
&& now.getMonth() == zonedDateTime.getMonth()
&& now.getDayOfMonth() == zonedDateTime.getDayOfMonth();
}
/**
* @param zonedDateTime a zoned date time to compare with "now".
* @return true if zonedDateTime is "today".
* Where today is defined as atStartOfDay() being equal.
*/
public static boolean isZoneDateTimeToday2(ZonedDateTime zonedDateTime) {
ZonedDateTime now = ZonedDateTime.now();
LocalDateTime atStartOfToday = now.toLocalDate().atStartOfDay();
LocalDateTime atStartOfDay = zonedDateTime.toLocalDate().atStartOfDay();
return atStartOfDay == atStartOfToday;
}
你问的值是“今天”的值的时区或JVM的默认时区? – Andreas
你不应该说ZonedDateTime now = ZonedDateTime.now()。它始终是当天的日期。意味着它永远是今天。 – Sedrick
首先,明确“今日”的含义! – slim