iOS-时间戳

/**
 *  生成时间戳
 *
 *  @return 时间戳
 */
- (NSString *)timeSp
{
    NSDate *datenow = [NSDate date];
    NSTimeZone *zone = [NSTimeZone timeZoneWithName:@"Asia/Shanghai"];
    NSInteger interval = [zone secondsFromGMTForDate:datenow];
    NSDate *localeDate = [datenow  dateByAddingTimeInterval: interval];
    NSString *timeSp = [NSString stringWithFormat:@"%f", [localeDate timeIntervalSince1970]];
    return timeSp;
}

//时间
    NSDate *now = [NSDate date];
    NSCalendar *calendar = [NSCalendar currentCalendar];
    NSUInteger unitFlags = NSCalendarUnitEra | NSCalendarUnitMonth | NSCalendarUnitDay | NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond;
    NSDateComponents *dateComponent = [calendar components:unitFlags fromDate:now];
    int year = [dateComponent year];
    int month = [dateComponent month];
    int day = [dateComponent day];
    int hour = [dateComponent hour];
    int minute = [dateComponent minute];
    int second = [dateComponent second];

//时间格式化
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    //设定时间格式,这里可以设置成自己需要的格式
    [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
    //用[NSDate date]可以获取系统当前时间
    NSString *currentDateStr = [dateFormatter stringFromDate:[NSDate date]];