NSDateComponents 的基本使用以及…

NSDateComponents与NSDate 相互转换

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

[comps setDay:6];

[comps setMonth:5];

[comps setYear:2004];

NSCalendar *gregorian = [[NSCalendar alloc]

    initWithCalendarIdentifier:NSGregorianCalendar];

NSDate *date = [gregorian dateFromComponents:comps];

[comps release];

NSDateComponents *weekdayComponents =

    [gregorian components:NSWeekdayCalendarUnit fromDate:date];

int weekday = [weekdayComponents weekday];

NSDate基本用法

Assume 1308847489 is # of seconds since 1970.

    NSDate*nd = [NSDate dateWithTimeIntervalSince1970:1308847489];

    NSDateFormatter*dateFormat = [[NSDateFormatter alloc] init];
    [dateFormatsetDateFormat:@"yyyy/MM/dd"];
    NSString*dateString = [dateFormat stringFromDate:nd];
    NSLog(@"date:%@", dateString);
    [dateFormatrelease];