[iOS]日付時刻関係のメソッドメモ

NSCalendar、NSDate、NSDateComponentsをうまく使用すること

//指定した日付でNSDateを作成

NSString *dateString = [[NSStringalloc] initWithFormat:@"2030/01/01 %02d:%02d:00", [cmphour], [cmpminute]];

NSDateFormatter *dateFormatter = [[NSDateFormatteralloc] init];

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

NSDate *date = [dateFormatter dateFromString:dateString];

[dateString relese];

[dateFormatter relese];

//現在時刻を取得

NSDate *date = [NSDate date];

//時間を追加する

NSDate *date = [NSDate date];

NSDate *newDate = [date dateByAddingTimeInterval:7*24*60*60];

//翌日に日付を取得

NSDateComponents *cmp = [[NSDateComponentsalloc] init];

[cmp setDay:1];

NSDate *date = [[NSCalendar currentCalendar] dateByAddingComponents:cmp toDate:[NSDate date] options:0];

[cmp release];