Java ResultSet如何以UTC格式获取TimeStamp [英] Java ResultSet how to getTimeStamp in UTC

问题描述

数据库包含UTC数据，当我尝试获取数据时

The database has data in UTC and when I try to get data

java.util.Calendar cal = Calendar.getInstance();
cal.setTimeZone(TimeZone.getTimeZone("UTC"));
java.sql.Timestamp ts = resultSet.getTimestamp(PUBLISH_TIME);
cal.setTime(ts);

这有什么问题吗？

推荐答案

您的DateFormat实例很可能以当地时间显示该值。显示您的值时，请尝试：

Your DateFormat instance is most likely displaying the value in local time. When displaying your value, give this a try:

java.util.Calendar cal = Calendar.getInstance();
cal.setTimeZone(TimeZone.getTimeZone("UTC"));
java.sql.Timestamp ts = resultSet.getTimestamp(PUBLISH_TIME);
cal.setTime(ts);

SimpleDateFormat sdf = new SimpleDateFormat("HH:mm:ss z");
sdf.setTimeZone(TimeZone.getTimeZone("UTC"));
System.out.println(sdf.format(cal.getTime()));

编辑：发表评论：

如果我使用GMT怎么办？这会是SimpleDateFormat中的一个问题

What if I use GMT, would that be an issue in SimpleDateFormat

SimpleDateFormat 可以使用通用时区（GMT +/- n）， RFC822 和文本（如果他们有名字作为JavaDoc状态 - 请参阅这篇文章有关名称的信息。）

SimpleDateFormat can use general timezones (GMT +/- n), RFC822, and text ("if they have names" as the JavaDoc states - see this post for info on the names).

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