IOS 将毫秒数转换为年月日时分秒的时间

NSString *_overTimeStr = [Util
ConvertStrToTime:@"1439348978000"];
NSLog(@"-------_overTimeStr:%@",_overTimeStr);

+ (NSString *)ConvertStrToTime:(NSString *)timeStr
{
long
long time=[timeStr longLongValue];
NSDate *d = [[NSDate
alloc]initWithTimeIntervalSince1970:time/1000.0];
NSDateFormatter *formatter = [[NSDateFormatter
alloc]init];
[formatter setDateFormat:@"yyyy/MM/dd HH:mm:ss"];
NSString*timeString=[formatter
stringFromDate:d];
return timeString;
}

打印结果：

2015-08-13 13:54:29.678 Tpper[3847:111053] -------_overTimeStr:2015/08/12 11:09:38