为 f:convertDateTime 设置默认时区 [英] Set a default time zone for f:convertDateTime

问题描述

我使用 JSF1.2，但时区有点问题.

I use JSF1.2 and I have a little problem with time zones.

日历尊重我的时区并在数据库中保存正确的时间.当我使用带有 f:convertDateTime 的 h:outputtext 显示它时，它显示了错误的日期(我认为使用默认时区).

Calendar respects my timezone and save the correct time in the Database. When I show it using a h:outputtext with a f:convertDateTime it shows the wrong date (I think with default time zone).

我可以这样做:

<h:outputText value="#{atividade.atividade.dataCriacao.time}">
  <f:convertDateTime pattern="#{msg.formatoDataCalendario2}" timeZone="America/Sao_Paulo" />
</h:outputText>

formatoDataCalendario2 = dd/MM/yyyy, HH:mm in messages.properties.

formatoDataCalendario2 = dd/MM/yyyy, HH:mm in messages.properties.

我也可以将时区放在消息中，但我相信它有一些我可以使用的配置.

I can put the time zone in messages too, but I believe it have some configuration that I could use.

推荐答案

JSF 日期/时间转换器默认为 UTC 时区.如果您想使用不同的时区，那么您确实需要自己在转换器中指定它.或者，如果您对生产运行时环境有 100% 的控制权，那么从 JSF 2.0 开始，您可以将其系统时区设置为所需的时区，并将以下上下文参数添加到 web.xml:

JSF date/time converters defaults by specification to UTC timezone. If you want to use a different timezone, then you really need to specify it in the converter yourself. Or, if you have 100% control over the production runtime environment, then since JSF 2.0 you can set its system timezone to the desired timezone and add the following context parameter to web.xml:

<context-param>
    <param-name>javax.faces.DATETIMECONVERTER_DEFAULT_TIMEZONE_IS_SYSTEM_TIMEZONE</param-name>
    <param-value>true</param-value>
</context-param>

这样 JSF 将使用由 TimeZone#getDefault() 作为转换器的默认时区.

This way JSF will use the system's timezone as obtained by TimeZone#getDefault() as converter's default timezone.

请注意，java.util.Date 对象本身也不存储任何时区信息.它也始终默认为 UTC 时区.在处理提交的日期/时间时请记住这一点.

Please note that the java.util.Date object by itself also does not store any timezone information. It also always defaults to UTC timezone. Keep this in mind when processing submitted date/times.

• 夏令时和时区最佳做法

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