将 java.time 转换为 Calendar
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Converting java.time to Calendar
提问by Daniel C. Sobral
What is the simplest way of getting a Calendarobject from a java.time.Instantor java.time.ZonedDateTime?
Calendar从 ajava.time.Instant或获取对象的最简单方法是java.time.ZonedDateTime什么？
回答by Rohit Jain
Getting a Calendarinstant from ZonedDateTimeis pretty straight-forward, provided you know that there exists a GregorianCalendar#from(ZonedDateTime)method. There was a discussion in Threeten-dev mail group, about why that method is not in Calendarclass. Not a very deep discussion though.
如果您知道存在一种方法，那么获取Calendar瞬间ZonedDateTime是非常简单的GregorianCalendar#from(ZonedDateTime)。在Threeten-dev 邮件组中有一个讨论，关于为什么该方法不在Calendar课堂上。虽然不是很深入的讨论。
However, there is no direct way to convert from an Instantto Calendar. You've to have an intermediate state for that:
但是，没有直接的方法可以从 an 转换Instant为Calendar。你必须有一个中间状态：
Instant instant = Instant.now();
ZonedDateTime zdt = ZonedDateTime.ofInstant(instant, ZoneId.systemDefault());
Calendar cal1 = GregorianCalendar.from(zdt);
This is probably because, as evident from the table on this oracle tutorial, an Instantmaps to Daterather than a Calendar. Similarly, a ZonedDateTimemaps to a Calendar.
这可能是因为，从本 oracle 教程的表格中可以明显看出， aInstant映射到Date而不是Calendar. 同样， aZonedDateTime映射到 a Calendar。
回答by Richard Barker
You need to get the TimeZone using the instant and then you can get a calendar.
您需要使用即时获取时区，然后才能获取日历。
Calendar myCalendar = GregorianCalendar.from(ZonedDateTime.ofInstant(Instant.now(), ZoneId.systemDefault()));
回答by Nils Breunese
How about GregorianCalendar.from(ZonedDateTime.ofInstant(instant, zoneId))?
怎么样GregorianCalendar.from(ZonedDateTime.ofInstant(instant, zoneId))？
