NSCalendar NSDateComponents

 

    // NSCalendar

    

    // 获取当前日历

    NSCalendar *calendar = [NSCalendar currentCalendar];

    

    // 获取当前时间日期的各个值

    NSDate *currentDate = [NSDate date];

    

    NSUInteger unitFlag = NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay | NSCalendarUnitHour |NSCalendarUnitMinute|NSCalendarUnitSecond;

    NSDateComponents *com = [calendar components:unitFlag fromDate:currentDate];

    

    NSLog(@"year = %i, month = %i, day = %i, hour = %i, minuts=%i, seconds = %i", com.year, com.month, com.day, com.hour, com.minute, com.second);

    

    // 通过各个值获取NSDate

    NSCalendar *calendar1 = [NSCalendar autoupdatingCurrentCalendar];

    NSDateComponents *settingComs = [[NSDateComponents alloc]init];

    settingComs.year = 2014;

    settingComs.month = 6;

    settingComs.day = 1;

    settingComs.hour = 11;

    settingComs.minute = 30;

    settingComs.second = 0;

    NSDate *settingDate = [calendar1 dateFromComponents:settingComs];

    NSLog(@"settingDate is : %@", settingDate);

    

    

    // 计算时间差

    NSCalendar *diffCalendar = [NSCalendar currentCalendar];

    NSString *str1 = @"2016-07-07 20:20:20";

    NSString *str2 = @"2016-07-01 10:10:10";

    

    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc]init];

    [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];

    

    NSDate *date1 = [dateFormatter dateFromString:str1];

    NSDate *date2 = [dateFormatter dateFromString:str2];

    

    NSUInteger diffCalendarUnitFlag = NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitDay|NSCalendarUnitMonth|NSCalendarUnitDay|NSCalendarUnitSecond;

    NSDateComponents *diffComs = [diffCalendar components:diffCalendarUnitFlag fromDate:date1 toDate:date2 options:0];

    NSLog(@"year = %i, month = %i, day = %i, hour = %i, minuts=%i, seconds = %i", diffComs.year, diffComs.month, diffComs.day, diffComs.hour, diffComs.minute, diffComs.second);