ios-日期组件

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日期组件在项目开发中用的不多 偶尔也会用到 系统给我们提供了一些功能较为完善的类 我们可以直接使用  - (void)showDate{    /**     *  日历类     *     *  @return     */    NSCalendar *calendar = [NSCalendar currentCalendar];        /**     *  获取系统当前时间     *     *  @return      */    NSDate *date = [NSDate date];        /**     *  日期组件     *     *  保存 年月日时分秒周     */        /**     *               NSCalendarUnitEra                = kCFCalendarUnitEra,     NSCalendarUnitYear               = kCFCalendarUnitYear,     NSCalendarUnitMonth              = kCFCalendarUnitMonth,     NSCalendarUnitDay                = kCFCalendarUnitDay,     NSCalendarUnitHour               = kCFCalendarUnitHour,     NSCalendarUnitMinute             = kCFCalendarUnitMinute,     NSCalendarUnitSecond             = kCFCalendarUnitSecond,     NSCalendarUnitWeekday            = kCFCalendarUnitWeekday,     NSCalendarUnitWeekdayOrdinal     = kCFCalendarUnitWeekdayOrdinal,     *     *  @param NSCalendarUnit     *     *  @return <#return value description#>     *///    NSDateComponents *componets = [calendar components:NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay | NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond | NSCalendarUnitWeekday fromDate:date];        NSDateComponents *componets = [calendar components:NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay | NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond | NSCalendarUnitWeekday fromDate:date];        /*     周日：1     周一：2     */    NSLog(@"%ld/%ld/%ld  周%ld",componets.year,componets.month,componets.day,componets.weekday - 1);        NSDate *date1 = [NSDate date];    NSDate *date2 = [NSDate dateWithTimeInterval:3600 sinceDate:date];        /**     *  1.两个时间相差多少秒 ABS     *     *  @return      */    [date1 timeIntervalSinceDate:date2];        /**     *  2.date 距离1970年1月1号的秒数     *     *  @return      */    NSTimeInterval seconds = [date1 timeIntervalSince1970];        [date1 timeIntervalSinceReferenceDate];        /**     *  指定距离现在时间差多少秒     *     *  @return      */    [date1 timeIntervalSinceNow];            }
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