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);