Question

我认为这已经被问过，但我找不到anything。

使用java.time确定给定ZonedDateTime是否为＆＃34;今天＆＃34;的最佳方法是什么？

我提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任何漏洞或陷阱。基本上我的想法是让java.time弄清楚而不是自己做任何数学：

/**
 * @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;
}

Answer 1

如果您今天在默认时区：

return zonedDateTime.toLocalDate().equals(LocalDate.now());

//you may want to clarify your intent by explicitly setting the time zone:
return zonedDateTime.toLocalDate().equals(LocalDate.now(ZoneId.systemDefault()));

如果您的意思是今天与ZonedDateTime在同一时区：

return zonedDateTime.toLocalDate().equals(LocalDate.now(zonedDateTime.getZone()));

如何确定ZonedDateTime是否是＆＃34;今天＆＃34;？

1 个答案: