时间戳转具体时间

# 时间戳转成时间
- (NSString *)timeWithTimeIntervalString:(NSString *)timeString {
    // 格式化时间
    NSDateFormatter* formatter = [[NSDateFormatter alloc] init];
    formatter.timeZone = [NSTimeZone timeZoneWithName:@"shanghai"];
    [formatter setDateStyle:NSDateFormatterMediumStyle];
    [formatter setTimeStyle:NSDateFormatterShortStyle];
    [formatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
    // 毫秒值转化为秒
    NSDate* date = [NSDate dateWithTimeIntervalSince1970:[timeString doubleValue]/ 1000.0];
    NSString* dateString = [formatter stringFromDate:date];
    return dateString;
}