IOSで文字列をNSDate
に変換するにはどうすればよいですか?
NSString *dateStr = @"20100223";
// Convert string to date object
NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setDateFormat:@"yyyyMMdd"];
NSDate *date = [dateFormat dateFromString:dateStr];
// Convert date object to desired output format
[dateFormat setDateFormat:@"EEEE MMMM d, YYYY"];
dateStr = [dateFormat stringFromDate:date];
[dateFormat release];
これがお役に立てば幸いです。
NSDateFormatter をご覧ください。日付文字列の形式を決定し、dateFromString:
を使用して文字列をNSDateオブジェクトに変換します。
NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setDateFormat:@"dd/MM/YYYY"];
NSDate *date = [dateFormat dateFromString:dateStr];
list = [self getYear:date];
- (NSMutableArray *)getYear:(NSDate*)date
{
NSDateComponents *components = [[NSCalendar currentCalendar] components:NSCalendarUnitDay | NSCalendarUnitMonth | NSCalendarUnitYear fromDate:date];
int year = [components year];
int month = [components month];
int day = [components day];
NSLog(@"%d",year);
NSMutableDictionary *dateDict = [[NSMutableDictionary alloc] initWithObjectsAndKeys:[NSString stringWithFormat:@"%d", day], @"day", [NSString stringWithFormat:@"%d", month], @"month", [NSString stringWithFormat:@"%d", year], @"year", nil];
return dateDict;
}
単純なアプローチ sqlite DBを使用している場合でも:
// NSTimeInterval is basically typedef of double so you can receive it as double also.
NSTimeInterval *current = [[NSDate date] timeIntervalSince1970];
[DB addToDB:current];
//retrieve the date from DB
NSDate *retrievedDateItem = [[NSDate alloc] initWithTimeIntervalSince1970:[getDBValueAsDouble]]; //convert it from double (NSTimeInterval) to NSDate
// Set the style
[dateFormatter setDateStyle:NSDateFormatterMediumStyle];
[dateFormatter setTimeStyle:NSDateFormatterMediumStyle];
// Converted to string
NSString *convertedDate = [dateFormatter stringFromDate:retrievedDateItem];
この例の出力:
2015年8月3日12:27:50 PM
Swiftでの私の作業バージョン
func dateFor(timeStamp: String) -> NSDate
{
let formater = NSDateFormatter()
formater.dateFormat = "HH:mm:ss:SSS - MMM dd, yyyy"
return formater.dateFromString(timeStamp)!
}
func timeStampFor(date: NSDate) -> String
{
let dateFormatter = NSDateFormatter()
dateFormatter.dateFormat = "HH:mm:ss:SSS - MMM dd, yyyy"
return dateFormatter.stringFromDate(date)
}
+(NSDate*)str2date:(NSString*)dateStr{
if ([dateStr isKindOfClass:[NSDate class]]) {
return (NSDate*)dateStr;
}
NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setDateFormat:@"yyyy-MM-dd"];
NSDate *date = [dateFormat dateFromString:dateStr];
return date;
}