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Units of Measurement Standard - This JSR specifies Java packages for modeling and working with measurement values, quantities and their corresponding units.

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/*
 * Units of Measurement API
 * Copyright (c) 2014-2023, Jean-Marie Dautelle, Werner Keil, Otavio Santana.
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions
 *    and the following disclaimer in the documentation and/or other materials provided with the distribution.
 *
 * 3. Neither the name of JSR-385 nor the names of its contributors may be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package javax.measure.quantity;

import javax.measure.Quantity;

/**
 * Period of existence or persistence. The metric system unit for this quantity is "s" (second).
 *
 * The second, symbol s, is the SI unit of time. It is defined by taking the fixed
 * numerical value of the caesium frequency ∆νCs, the unperturbed ground-state
 * hyperfine transition frequency of the caesium 133 atom, to be 9 192 631 770 when
 * expressed in the unit Hz, which is equal to s⁻¹.
 *
 * This definition implies the exact relation ∆νCs = 9 192 631 770 Hz. Inverting this relation
 * gives an expression for the unit second in terms of the defining constant ∆νCs:
 *
 * 1 Hz = ∆νCs / 9 192 631 770  or  1 s = 9 192 631 770 / ∆νCs
 * 

 * 
 * API Note:
SI Base Unit
 * 
 * 
 * @author Werner Keil
 * @author Thodoris Bais
 * @version 2.1
 * @since 1.0
 *
 * @see Frequency
 * @see Speed
 * @see Acceleration
 * @see ElectricCurrent
 * @see Power
 * @see Wikipedia: Unit of time
 */
public interface Time extends Quantity {
}