Flink时间转换工具类

import java.time.LocalDateTime; import java.time.ZoneId; import java.time.ZoneOffset; import java.time.format.DateTimeFormatter; import java.util.Date;  public class DateFormatUtil {      private static final DateTimeFormatter dtf = DateTimeFormatter.ofPattern("yyyy-MM-dd");     private static final DateTimeFormatter dtfFull = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");      public static Long toTs(String dtStr, boolean isFull) {          LocalDateTime localDateTime = null;         if (!isFull) {             dtStr = dtStr   " 00:00:00";         }         localDateTime = LocalDateTime.parse(dtStr, dtfFull);          return localDateTime.toInstant(ZoneOffset.of(" 8")).toEpochMilli();     }      public static Long toTs(String dtStr) {         return toTs(dtStr, false);     }      public static String toDate(Long ts) {         Date dt = new Date(ts);         LocalDateTime localDateTime = LocalDateTime.ofInstant(dt.toInstant(), ZoneId.systemDefault());         return dtf.format(localDateTime);     }      public static String toYmdHms(Long ts) {         Date dt = new Date(ts);         LocalDateTime localDateTime = LocalDateTime.ofInstant(dt.toInstant(), ZoneId.systemDefault());         return dtfFull.format(localDateTime);     }      public static void main(String[] args) {         System.out.println(toYmdHms(System.currentTimeMillis()));     } }