通过Android获得GMT时间

我一直在StackOverflow中深入研究这个问题
Android get Current UTC time
和
How can I get the current date and time in UTC or GMT in Java?

我尝试了两种方法来获取GMT手机的当前时间.我在西班牙,差异是GMT 2.所以让我们看一个例子：
1º尝试：我创建了一个格式并将其应用于System.currentTimeMillis();

    DateFormat dfgmt = new java.text.SimpleDateFormat("yyyy-MM-dd hh:mm:ss");   
    dfgmt.setTimeZone(TimeZone.getTimeZone("GMT")); 
    String gmtTime = dfgmt.format(new Date());
    //Using System.currentTimeMillis() is the same as new Date()
    Date dPhoneTime = dfgmt.parse(gmtTime);
    Long phoneTimeUTC = dPhoneTime.getTime();

我需要将这个时间减去另一个时间,这就是为什么我将演员阵容转换为Long.

    DateFormat df = new java.text.SimpleDateFormat("yyyy-MM-dd hh:mm:ss");          
    Date arrivalDate = df.parse(item.getArrivalDate());
    //the String comes from JSON and is for example:"UTC_arrival":"2011-05-16 18:00:00"
    //which already is in UTC format. So the DateFormat doesnt have the GMT paramater as dfgmt
    diff = arrival.getTime() - phoneTimeUTC ;

我也试过这个：

    Calendar aGMTCalendar = Calendar.getInstance(TimeZone.getTimeZone("GMT"));
    Long phoneTimeUTC = aGMTCalendar.getTimeInMillis()

而且我仍然没有得到正确的区别.但如果我这样做：

    Long phoneTimeUTC = aGMTCalendar.getTimeInMillis()-3600000*2;

它确实有效.

有任何想法吗？

非常感谢,

大卫.

解决方法:

据我读到calendar.getTimeInMillis();以毫秒为单位返回UTC时间.我使用以下代码并将其与此站点http://www.xav.com/time.cgi中的Epoch进行了比较.

public int GetUnixTime()
{
    Calendar calendar = Calendar.getInstance();
    long now = calendar.getTimeInMillis();
    int utc = (int)(now / 1000);
    return (utc);

}

Giora

标签：gmt,android,date-format
来源： https://codeday.me/bug/20190926/1819129.html