LocalDateTime工具類（常用轉換）

public class LocalDateTimeUtils {
    
    public static String  format(LocalDateTime datetime, DateTimeFormatter formatter){
        return formatter.format(datetime);
    }

    /**
     * 對LocalDateTime進行指定格式的格式換並轉字串
     * @param datetime 
     * @param pattern 
     * @return
     */
    public static String format(LocalDateTime datetime,String pattern){
        return DateTimeFormatter.ofPattern(pattern).format(datetime);
    }

    /**
     * 得到LocalDateTime對應的時間單位秒
     * @param datetime
     * @return
     */
    public static long getTotalSeconds(LocalDateTime datetime){
        Clock clock = Clock.systemDefaultZone();
        ZoneOffset offset = clock.getZone().getRules().getOffset(clock.instant());
        return datetime.toEpochSecond(offset);
    }

    /**
     *將時間字串轉化成LocalDateTime
     * @param datetime "2020-12-14 10:56:11"
     * @param pattern "yyyy-MM-dd HH:mm:ss"
     * @return
     */
    public static LocalDateTime parse(String datetime,String pattern){
        return LocalDateTime.parse(datetime,DateTimeFormatter.ofPattern(pattern));
        //LocalDateTimeStringConverter converter = new LocalDateTimeStringConverter();
    }

    /**
     * 將時間轉化成秒
     * @param datetime "2020-12-14 10:56:11"
     * @param pattern "yyyy-MM-dd HH:mm:ss"
     * @return
     */
    public static long convertString2Seconds(String datetime,String pattern){
        return getTotalSeconds(parse(datetime,pattern));
    }


}