src/java.base/share/classes/java/time/LocalTime.java

*** 1486,1495 ****
--- 1486,1510 ----
          total += minute * NANOS_PER_MINUTE;
          total += second * NANOS_PER_SECOND;
          total += nano;
          return total;
      }
+     /**
+      * Converts this {@code LocalTime} to the number of seconds since the epoch
+      * of 1970-01-01T00:00:00Z.
+      * <p>
+      * This returns the number of seconds from the epoch for this {@link LocalTime}.
+      *
+      * @param offset the zone offset, not null
+      * @return the number of seconds since the epoch of 1970-01-01T00:00:00Z, may be negative
+      */
+     public int toEpochSecond(ZoneOffset offset) {
+         Objects.requireNonNull(offset, "offset");
+         int secs = toSecondOfDay();
+         secs -= offset.getTotalSeconds();
+         return secs;
+     }
  
      //-----------------------------------------------------------------------
      /**
       * Compares this time to another time.
       * <p>