//将十三位的时间戳转换为日期
- (NSString *)getDate:(NSString *)jsonDate
{
//jsonDate类似这种/Date(1447659630000)/
NSArray *strArray = [jsonDate componentsSeparatedByString:@"("];
double timestampval = [strArray[1] doubleValue]/1000;
NSTimeInterval timestamp = (NSTimeInterval)timestampval;
NSDate *updatetimestamp = [NSDate dateWithTimeIntervalSince1970:timestamp];
NSDateFormatter* formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"yyyy-MM-dd"];
NSString *dateString = [formatter stringFromDate:updatetimestamp];
return dateString;
}