解析时间字符串 [英] Parse time of day string

问题描述

输入是一个字符串，如23:55或09:20，即HH：mm格式。我希望字符串以UTC格式指定时间。我想使用java.time将字符串和输出解析为具有指定时间的Instant。如果需要，我可以在字符串中附加一个时区，即23:55 UTC。

Input is a string such as "23:55" or "09:20", i.e. in the "HH:mm" format. I want the string to specify the time of day in UTC. I want to use java.time to parse the string and the output to be an Instant with the specified time of day today. If needed I can append a time zone to the string, i.e. "23:55 UTC".

我想使用生成的瞬间来计算现在和上述瞬间之间的纳米数。 I.e。

I want to use the resulting instant to calculate the number of nanos between now and the mentioned instant. I.e.

Duration.between(Instant.now(), resultingInstant).toNanos();

编辑：可能找到解决方案：

Might have found a solution:

resultingInstant = LocalTime.parse("23:55").atDate(LocalDate.now(ZoneOffset.UTC)).toInstant(ZoneOffset.‌​UTC)

推荐答案

另一种方法是使用ZonedDateTime：

An alternative is to use a ZonedDateTime:

import static java.time.ZoneOffset.UTC;
import static java.time.temporal.ChronoUnit.NANOS;

LocalDate today = LocalDate.now(UTC);
ZonedDateTime resultingDate = ZonedDateTime.of(today, LocalTime.parse("23:55"), UTC);
long nanos = NANOS.between(ZonedDateTime.now(), resultingDate);

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