Here you can find the source of unixTimestampFromDate(final Date date)
public static long unixTimestampFromDate(final Date date)
//package com.java2s; /**//from w w w .jav a 2 s. c o m * Copyright (c) 2012 Alvin S.J. Ng * * Permission is hereby granted, free of charge, to any person obtaining * a copy of this software and associated documentation files (the * "Software"), to deal in the Software without restriction, including * without limitation the rights to use, copy, modify, merge, publish, * distribute, sublicense, and/or sell copies of the Software, and to * permit persons to whom the Software is furnished to do so, subject * to the following conditions: * * The above copyright notice and this permission notice shall be * included in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT * WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR * PURPOSE AND NONINFRINGEMENT. IN NO EVENT * SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, * TORT OR OTHERWISE, ARISING FROM, OUT OF OR * IN CONNECTION WITH THE SOFTWARE OR * THE USE OR OTHER DEALINGS IN THE SOFTWARE. * * @author Alvin S.J. Ng <alvinsj.ng@gmail.com> * @copyright 2012 Alvin S.J. Ng * */ import java.util.Calendar; import java.util.Date; public class Main { public static long unixTimestampFromDate(final Date date) { final Calendar cal = Calendar.getInstance(); cal.setTime(date); return cal.getTimeInMillis() / 1000; } }