Java使用SimpleDateFormat解析帶'Z'的日期方法

首頁 > 程式設計 > Java使用SimpleDateFormat解析帶'Z'的日期方法

Java使用SimpleDateFormat解析帶'Z'的日期方法

發佈於2025-04-17

$How to Correctly Parse Dates with \'Z\' Literal in Java using SimpleDateFormat?$

SimpleDateFormat Parsing Date with 'Z' Literal

When attempting to parse a date in ISO 8601 format using SimpleDateFormat, it may fail to correctly handle the 'Z' literal, which denotes UTC as the preferred reference point. For instance, parsing the string "2010-04-05T17:16:00Z" using the pattern "yyyy-MM-dd'T'HH:mm:ss" will result in an incorrect local time.

The traditional patterns "yyyy-MM-dd'T'HH:mm:ssz" and "yyyy-MM-dd'T'HH:mm:ssZ" are also不足以解析“ z”字面的日期。這種行為似乎是違反直覺的，因為“ z”字面明確指示UTC。

solution

For example:

SimpleDateFormat sdf = new SimpleDateFormat（“ yyyy-mm-dd'hh：mm：ssx”）; Date date = sdf.parse("2010-04-05T17:16:00Z");

This will parse the date correctly as a UTC time.

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssX");
Date date = sdf.parse("2010-04-05T17:16:00Z");

Another alternative is to use the java.time package introduced in Java 8, which provides a more modern and comprehensive date and time API。以下代碼使用java.Time解析日期：

import java.time.instant; 導入Java.Time.ZonedDateTime; 字符串datestring =“ 2010-04-05T17：16：00z”; instant instant = instant.parse（datestring）; ZonedDateTime ZonedDateTime = Instant.Atzone（ZoneId.of（“ Z”））; 此方法消除了對複雜模式或顯式時區設置的需求，因為Java.Time作為Java。