Objective-C日期相關工具方法

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//date根據formatter轉換成string+(NSString*)dateToString:(NSString *)formatter date:(NSDate *)date{    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];    [dateFormatter setDateFormat:formatter];    return[dateFormatter stringFromDate:date];}//string類型的時間戳記轉換成時間+(NSString*)dateStringToString:(NSString *)dateStr{    if ([dateStr isKindOfClass:[NSNull class]]) {        return nil;    } else {        NSInteger time = [dateStr intValue];        NSDate *date = [NSDate dateWithTimeIntervalSince1970:time];        NSString *timestr = [NSString stringWithFormat:@"%@",date];        NSRange rang;        rang.location = 0;O        rang.length = 10;        NSString *needtime = [timestr substringWithRange:rang];        return needtime;    }}//將日期從原格式轉換成需要的格式+(NSString*)convertDateFormatter:(NSString*)sourceFormatter targetFormatter:(NSString*)targetFormatter dateString:(NSString*)dateString{    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];    [dateFormatter setDateFormat:sourceFormatter];    NSDate *date = [dateFormatter dateFromString:dateString];    [dateFormatter setDateFormat:targetFormatter];    return[dateFormatter stringFromDate:date];}//將日期文字轉換成date+(NSDate *)stringToDate:(NSString *)formatter dateString:(NSString *)dateString{    NSDateFormatter *dateFormatter= [[NSDateFormatter alloc] init];    [dateFormatter setDateFormat:formatter];    return [dateFormatter dateFromString:dateString];}