Android：获取两个时区之间的时间差（秒）

Question

我是Android新手。

如何在Android中以秒为单位获得两个时区之间的差异？

例如，亚洲/德黑兰（+4：30）和亚洲/巴格达（+3：00）之间的差异为5400秒（1:30小时）。

Answer 1

问题就迎刃而解了：

int loc2 = TimeZone.getTimeZone("Asia/Tehran").getRawOffset(); 
int loc1 = TimeZone.getTimeZone("UTC").getRawOffset(); 
return (loc2 - loc1)/1000; 

为了更准确地（夏季每天亮灯时间）计算：

public int getTimezoneDifferenceInSecond(String zone1, String zone2) { 
    Date now = new Date(); 
    TimeZone timeZone1 = TimeZone.getTimeZone(zone1); 
    TimeZone timeZone2 = TimeZone.getTimeZone(zone2); 

    int currentOffsetFromUTC = timeZone1.getRawOffset() + (timeZone1.inDaylightTime(now) ? timeZone1.getDSTSavings() : 0); 
    int serverOffsetFromUTC = timeZone2.getRawOffset() + (timeZone2.inDaylightTime(now) ? timeZone2.getDSTSavings() : 0); 
    return (serverOffsetFromUTC - currentOffsetFromUTC)/1000; 
} 

Answer 2

DateFormat df1 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); 

//you should now have timezone calculated in miliseconds 
df1.setTimeZone(TimeZone.getTimeZone("<timezone_you_want>")); 
df2.setTimeZone(TimeZone.getTimeZone("<timezone_you_want>")); 

//do the difference and calculate hours 
long diffInMillisec = df1 - df2; 
long diffInSec = TimeUnit.MILLISECONDS.toSeconds(diffInMillisec);