src/java.base/share/classes/java/time/chrono/Chronology.java

*** 1,7 ****
  /*
!  * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
--- 1,7 ----
  /*
!  * Copyright (c) 2012, 2016, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
*** 65,74 ****
--- 65,75 ----
  import java.time.DateTimeException;
  import java.time.Instant;
  import java.time.LocalDate;
  import java.time.LocalTime;
  import java.time.ZoneId;
+ import java.time.ZoneOffset;
  import java.time.format.DateTimeFormatterBuilder;
  import java.time.format.ResolverStyle;
  import java.time.format.TextStyle;
  import java.time.temporal.ChronoField;
  import java.time.temporal.TemporalAccessor;
*** 710,719 ****
--- 711,766 ----
       */
      default ChronoPeriod period(int years, int months, int days) {
          return new ChronoPeriodImpl(this, years, months, days);
      }
  
+     //---------------------------------------------------------------------
+ 
+     /**
+      * Gets the number of seconds from the Java epoch of 1970-01-01T00:00:00Z.
+      * <p>
+      * Returns the number of seconds from the epoch of 1970-01-01T00:00:00Z
+      * formed using given prolepticYear, month, dayOfMonth , hour, minute, second and zoneOffset.
+      *
+      * @param prolepticYear the chronology proleptic-year
+      * @param month the chronology month-of-year
+      * @param dayOfMonth the chronology day-of-month
+      * @param hour the hour-of-day to represent, from 0 to 23
+      * @param minute the minute-of-hour to represent, from 0 to 59
+      * @param second the second-of-minute to represent, from 0 to 59
+      * @param zoneOffset the zone offset, not null
+      * @return the number of seconds relative to 1970-01-01T00:00:00Z, may be negative
+      */
+      public default long epochSecond(int prolepticYear, int month, int dayOfMonth,
+                                      int hour, int minute, int second, ZoneOffset zoneOffset) {
+         Objects.requireNonNull(zoneOffset, "zoneOffset");
+         long daysInSec = Math.multiplyExact(date(prolepticYear, month, dayOfMonth).toEpochDay(), 86400);
+         long timeinSec = (hour * 60 + minute) * 60 + second;
+         return Math.addExact(daysInSec, timeinSec - zoneOffset.getTotalSeconds());
+     }
+ 
+     /**
+      * Gets the number of seconds from the epoch of 1970-01-01T00:00:00Z.
+      * <p>
+      * The number of seconds is caluculated using given era, prolepticYear,
+      * month, dayOfMonth , hour, minute, second and zoneOffset.
+      *
+      * @param era  the era of the correct type for the chronology, not null
+      * @param yearOfEra the chronology year-of-era
+      * @param month the chronology month-of-year
+      * @param dayOfMonth the chronology day-of-month
+      * @param hour the hour-of-day to represent, from 0 to 23
+      * @param minute the minute-of-hour to represent, from 0 to 59
+      * @param second the second-of-minute to represent, from 0 to 59
+      * @param zoneOffset the zone offset, not null
+      * @return the number of seconds relative to 1970-01-01T00:00:00Z, may be negative
+      */
+      public default long epochSecond(Era era, int yearOfEra, int month, int dayOfMonth,
+                                      int hour, int minute, int second, ZoneOffset zoneOffset) {
+         Objects.requireNonNull(era, "era");
+         return epochSecond(prolepticYear(era, yearOfEra), month, dayOfMonth, hour, minute, second, zoneOffset);
+     }
      //-----------------------------------------------------------------------
      /**
       * Compares this chronology to another chronology.
       * <p>
       * The comparison order first by the chronology ID string, then by any