https://openjdk.java.net/ 
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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package java.sql;

import java.time.Instant;
import java.time.LocalDateTime;
import java.util.StringTokenizer;


A thin wrapper around java.util.Date that allows
the JDBC API to identify this as an SQL TIMESTAMP value.
It adds the ability
to hold the SQL TIMESTAMP fractional seconds value, by allowing
the specification of fractional seconds to a precision of nanoseconds.
A Timestamp also provides formatting and
parsing operations to support the JDBC escape syntax for timestamp values.

The precision of a Timestamp object is calculated to be either:

    

  • 19 , which is the number of characters in yyyy-mm-dd hh:mm:ss

  •   20 + s , which is the number
of characters in the yyyy-mm-dd hh:mm:ss.[fff...] and s represents  the scale of the given Timestamp,
its fractional seconds precision.



Note: This type is a composite of a java.util.Date and a
separate nanoseconds value. Only integral seconds are stored in the
java.util.Date component. The fractional seconds - the nanos - are
separate.  The Timestamp.equals(Object) method never returns
true when passed an object
that isn't an instance of java.sql.Timestamp,
because the nanos component of a date is unknown.
As a result, the Timestamp.equals(Object)
method is not symmetric with respect to the
java.util.Date.equals(Object)
method.  Also, the hashCode method uses the underlying
java.util.Date
implementation and therefore does not include nanos in its computation.


Due to the differences between the Timestamp class
and the java.util.Date
class mentioned above, it is recommended that code not view
Timestamp values generically as an instance of
java.util.Date.  The
inheritance relationship between Timestamp
and java.util.Date really
denotes implementation inheritance, and not type inheritance.

/**
 * <P>A thin wrapper around <code>java.util.Date</code> that allows
 * the JDBC API to identify this as an SQL <code>TIMESTAMP</code> value.
 * It adds the ability
 * to hold the SQL <code>TIMESTAMP</code> fractional seconds value, by allowing
 * the specification of fractional seconds to a precision of nanoseconds.
 * A Timestamp also provides formatting and
 * parsing operations to support the JDBC escape syntax for timestamp values.
 *
 * <p>The precision of a Timestamp object is calculated to be either:
 * <ul>
 * <li><code>19 </code>, which is the number of characters in yyyy-mm-dd hh:mm:ss
 * <li> <code> 20 + s </code>, which is the number
 * of characters in the yyyy-mm-dd hh:mm:ss.[fff...] and <code>s</code> represents  the scale of the given Timestamp,
 * its fractional seconds precision.
 *</ul>
 *
 * <P><B>Note:</B> This type is a composite of a <code>java.util.Date</code> and a
 * separate nanoseconds value. Only integral seconds are stored in the
 * <code>java.util.Date</code> component. The fractional seconds - the nanos - are
 * separate.  The <code>Timestamp.equals(Object)</code> method never returns
 * <code>true</code> when passed an object
 * that isn't an instance of <code>java.sql.Timestamp</code>,
 * because the nanos component of a date is unknown.
 * As a result, the <code>Timestamp.equals(Object)</code>
 * method is not symmetric with respect to the
 * <code>java.util.Date.equals(Object)</code>
 * method.  Also, the <code>hashCode</code> method uses the underlying
 * <code>java.util.Date</code>
 * implementation and therefore does not include nanos in its computation.
 * <P>
 * Due to the differences between the <code>Timestamp</code> class
 * and the <code>java.util.Date</code>
 * class mentioned above, it is recommended that code not view
 * <code>Timestamp</code> values generically as an instance of
 * <code>java.util.Date</code>.  The
 * inheritance relationship between <code>Timestamp</code>
 * and <code>java.util.Date</code> really
 * denotes implementation inheritance, and not type inheritance.
 */
public class Timestamp extends java.util.Date {

    
Constructs a Timestamp object initialized
with the given values.

Params:
  • year – the year minus 1900
  • month – 0 to 11
  • date – 1 to 31
  • hour – 0 to 23
  • minute – 0 to 59
  • second – 0 to 59
  • nano – 0 to 999,999,999
Throws:
Deprecated:instead use the constructor Timestamp(long millis)
/**
     * Constructs a <code>Timestamp</code> object initialized
     * with the given values.
     *
     * @param year the year minus 1900
     * @param month 0 to 11
     * @param date 1 to 31
     * @param hour 0 to 23
     * @param minute 0 to 59
     * @param second 0 to 59
     * @param nano 0 to 999,999,999
     * @deprecated instead use the constructor <code>Timestamp(long millis)</code>
     * @exception IllegalArgumentException if the nano argument is out of bounds
     */
    @Deprecated
    public Timestamp(int year, int month, int date,
                     int hour, int minute, int second, int nano) {
        super(year, month, date, hour, minute, second);
        if (nano > 999999999 || nano < 0) {
            throw new IllegalArgumentException("nanos > 999999999 or < 0");
        }
        nanos = nano;
    }

    
Constructs a Timestamp object
using a milliseconds time value. The
integral seconds are stored in the underlying date value; the
fractional seconds are stored in the nanos field of
the Timestamp object.

Params:
  • time – milliseconds since January 1, 1970, 00:00:00 GMT.
       A negative number is the number of milliseconds before
        January 1, 1970, 00:00:00 GMT.
See Also:
/**
     * Constructs a <code>Timestamp</code> object
     * using a milliseconds time value. The
     * integral seconds are stored in the underlying date value; the
     * fractional seconds are stored in the <code>nanos</code> field of
     * the <code>Timestamp</code> object.
     *
     * @param time milliseconds since January 1, 1970, 00:00:00 GMT.
     *        A negative number is the number of milliseconds before
     *         January 1, 1970, 00:00:00 GMT.
     * @see java.util.Calendar
     */
    public Timestamp(long time) {
        super((time/1000)*1000);
        nanos = (int)((time%1000) * 1000000);
        if (nanos < 0) {
            nanos = 1000000000 + nanos;
            super.setTime(((time/1000)-1)*1000);
        }
    }

    
Sets this Timestamp object to represent a point in time that is
time milliseconds after January 1, 1970 00:00:00 GMT.

Params:
  • time –   the number of milliseconds.
See Also:
/**
     * Sets this <code>Timestamp</code> object to represent a point in time that is
     * <tt>time</tt> milliseconds after January 1, 1970 00:00:00 GMT.
     *
     * @param time   the number of milliseconds.
     * @see #getTime
     * @see #Timestamp(long time)
     * @see java.util.Calendar
     */
    public void setTime(long time) {
        super.setTime((time/1000)*1000);
        nanos = (int)((time%1000) * 1000000);
        if (nanos < 0) {
            nanos = 1000000000 + nanos;
            super.setTime(((time/1000)-1)*1000);
        }
    }

    
Returns the number of milliseconds since January 1, 1970, 00:00:00 GMT
represented by this Timestamp object.

See Also:
Returns: the number of milliseconds since January 1, 1970, 00:00:00 GMT
         represented by this date.
/**
     * Returns the number of milliseconds since January 1, 1970, 00:00:00 GMT
     * represented by this <code>Timestamp</code> object.
     *
     * @return  the number of milliseconds since January 1, 1970, 00:00:00 GMT
     *          represented by this date.
     * @see #setTime
     */
    public long getTime() {
        long time = super.getTime();
        return (time + (nanos / 1000000));
    }


    
@serial
/**
     * @serial
     */
    private int nanos;

    
Converts a String object in JDBC timestamp escape format to a
Timestamp value.

Params:
  • s – timestamp in format yyyy-[m]m-[d]d hh:mm:ss[.f...].  The
fractional seconds may be omitted. The leading zero for mm
and dd may also be omitted.
Throws:
Returns:corresponding Timestamp value
/**
     * Converts a <code>String</code> object in JDBC timestamp escape format to a
     * <code>Timestamp</code> value.
     *
     * @param s timestamp in format <code>yyyy-[m]m-[d]d hh:mm:ss[.f...]</code>.  The
     * fractional seconds may be omitted. The leading zero for <code>mm</code>
     * and <code>dd</code> may also be omitted.
     *
     * @return corresponding <code>Timestamp</code> value
     * @exception java.lang.IllegalArgumentException if the given argument
     * does not have the format <code>yyyy-[m]m-[d]d hh:mm:ss[.f...]</code>
     */
    public static Timestamp valueOf(String s) {
        final int YEAR_LENGTH = 4;
        final int MONTH_LENGTH = 2;
        final int DAY_LENGTH = 2;
        final int MAX_MONTH = 12;
        final int MAX_DAY = 31;
        String date_s;
        String time_s;
        String nanos_s;
        int year = 0;
        int month = 0;
        int day = 0;
        int hour;
        int minute;
        int second;
        int a_nanos = 0;
        int firstDash;
        int secondDash;
        int dividingSpace;
        int firstColon = 0;
        int secondColon = 0;
        int period = 0;
        String formatError = "Timestamp format must be yyyy-mm-dd hh:mm:ss[.fffffffff]";
        String zeros = "000000000";
        String delimiterDate = "-";
        String delimiterTime = ":";

        if (s == null) throw new java.lang.IllegalArgumentException("null string");

        // Split the string into date and time components
        s = s.trim();
        dividingSpace = s.indexOf(' ');
        if (dividingSpace > 0) {
            date_s = s.substring(0,dividingSpace);
            time_s = s.substring(dividingSpace+1);
        } else {
            throw new java.lang.IllegalArgumentException(formatError);
        }

        // Parse the date
        firstDash = date_s.indexOf('-');
        secondDash = date_s.indexOf('-', firstDash+1);

        // Parse the time
        if (time_s == null)
            throw new java.lang.IllegalArgumentException(formatError);
        firstColon = time_s.indexOf(':');
        secondColon = time_s.indexOf(':', firstColon+1);
        period = time_s.indexOf('.', secondColon+1);

        // Convert the date
        boolean parsedDate = false;
        if ((firstDash > 0) && (secondDash > 0) && (secondDash < date_s.length() - 1)) {
            String yyyy = date_s.substring(0, firstDash);
            String mm = date_s.substring(firstDash + 1, secondDash);
            String dd = date_s.substring(secondDash + 1);
            if (yyyy.length() == YEAR_LENGTH &&
                    (mm.length() >= 1 && mm.length() <= MONTH_LENGTH) &&
                    (dd.length() >= 1 && dd.length() <= DAY_LENGTH)) {
                 year = Integer.parseInt(yyyy);
                 month = Integer.parseInt(mm);
                 day = Integer.parseInt(dd);

                if ((month >= 1 && month <= MAX_MONTH) && (day >= 1 && day <= MAX_DAY)) {
                    parsedDate = true;
                }
            }
        }
        if (! parsedDate) {
            throw new java.lang.IllegalArgumentException(formatError);
        }

        // Convert the time; default missing nanos
        if ((firstColon > 0) & (secondColon > 0) &
            (secondColon < time_s.length()-1)) {
            hour = Integer.parseInt(time_s.substring(0, firstColon));
            minute =
                Integer.parseInt(time_s.substring(firstColon+1, secondColon));
            if ((period > 0) & (period < time_s.length()-1)) {
                second =
                    Integer.parseInt(time_s.substring(secondColon+1, period));
                nanos_s = time_s.substring(period+1);
                if (nanos_s.length() > 9)
                    throw new java.lang.IllegalArgumentException(formatError);
                if (!Character.isDigit(nanos_s.charAt(0)))
                    throw new java.lang.IllegalArgumentException(formatError);
                nanos_s = nanos_s + zeros.substring(0,9-nanos_s.length());
                a_nanos = Integer.parseInt(nanos_s);
            } else if (period > 0) {
                throw new java.lang.IllegalArgumentException(formatError);
            } else {
                second = Integer.parseInt(time_s.substring(secondColon+1));
            }
        } else {
            throw new java.lang.IllegalArgumentException(formatError);
        }

        return new Timestamp(year - 1900, month - 1, day, hour, minute, second, a_nanos);
    }

    
Formats a timestamp in JDBC timestamp escape format.
        yyyy-mm-dd hh:mm:ss.fffffffff,
where ffffffffff indicates nanoseconds.



Returns:a String object in
          yyyy-mm-dd hh:mm:ss.fffffffff format
/**
     * Formats a timestamp in JDBC timestamp escape format.
     *         <code>yyyy-mm-dd hh:mm:ss.fffffffff</code>,
     * where <code>ffffffffff</code> indicates nanoseconds.
     * <P>
     * @return a <code>String</code> object in
     *           <code>yyyy-mm-dd hh:mm:ss.fffffffff</code> format
     */
    @SuppressWarnings("deprecation")
    public String toString () {

        int year = super.getYear() + 1900;
        int month = super.getMonth() + 1;
        int day = super.getDate();
        int hour = super.getHours();
        int minute = super.getMinutes();
        int second = super.getSeconds();
        String yearString;
        String monthString;
        String dayString;
        String hourString;
        String minuteString;
        String secondString;
        String nanosString;
        String zeros = "000000000";
        String yearZeros = "0000";
        StringBuffer timestampBuf;

        if (year < 1000) {
            // Add leading zeros
            yearString = "" + year;
            yearString = yearZeros.substring(0, (4-yearString.length())) +
                yearString;
        } else {
            yearString = "" + year;
        }
        if (month < 10) {
            monthString = "0" + month;
        } else {
            monthString = Integer.toString(month);
        }
        if (day < 10) {
            dayString = "0" + day;
        } else {
            dayString = Integer.toString(day);
        }
        if (hour < 10) {
            hourString = "0" + hour;
        } else {
            hourString = Integer.toString(hour);
        }
        if (minute < 10) {
            minuteString = "0" + minute;
        } else {
            minuteString = Integer.toString(minute);
        }
        if (second < 10) {
            secondString = "0" + second;
        } else {
            secondString = Integer.toString(second);
        }
        if (nanos == 0) {
            nanosString = "0";
        } else {
            nanosString = Integer.toString(nanos);

            // Add leading zeros
            nanosString = zeros.substring(0, (9-nanosString.length())) +
                nanosString;

            // Truncate trailing zeros
            char[] nanosChar = new char[nanosString.length()];
            nanosString.getChars(0, nanosString.length(), nanosChar, 0);
            int truncIndex = 8;
            while (nanosChar[truncIndex] == '0') {
                truncIndex--;
            }

            nanosString = new String(nanosChar, 0, truncIndex + 1);
        }

        // do a string buffer here instead.
        timestampBuf = new StringBuffer(20+nanosString.length());
        timestampBuf.append(yearString);
        timestampBuf.append("-");
        timestampBuf.append(monthString);
        timestampBuf.append("-");
        timestampBuf.append(dayString);
        timestampBuf.append(" ");
        timestampBuf.append(hourString);
        timestampBuf.append(":");
        timestampBuf.append(minuteString);
        timestampBuf.append(":");
        timestampBuf.append(secondString);
        timestampBuf.append(".");
        timestampBuf.append(nanosString);

        return (timestampBuf.toString());
    }

    
Gets this Timestamp object's nanos value.

See Also:
Returns:this Timestamp object's fractional seconds component
/**
     * Gets this <code>Timestamp</code> object's <code>nanos</code> value.
     *
     * @return this <code>Timestamp</code> object's fractional seconds component
     * @see #setNanos
     */
    public int getNanos() {
        return nanos;
    }

    
Sets this Timestamp object's nanos field
to the given value.

Params:
  • n – the new fractional seconds component
Throws:
See Also:
/**
     * Sets this <code>Timestamp</code> object's <code>nanos</code> field
     * to the given value.
     *
     * @param n the new fractional seconds component
     * @exception java.lang.IllegalArgumentException if the given argument
     *            is greater than 999999999 or less than 0
     * @see #getNanos
     */
    public void setNanos(int n) {
        if (n > 999999999 || n < 0) {
            throw new IllegalArgumentException("nanos > 999999999 or < 0");
        }
        nanos = n;
    }

    
Tests to see if this Timestamp object is
equal to the given Timestamp object.

Params:
  • ts – the Timestamp value to compare with
Returns:true if the given Timestamp
        object is equal to this Timestamp object;
        false otherwise
/**
     * Tests to see if this <code>Timestamp</code> object is
     * equal to the given <code>Timestamp</code> object.
     *
     * @param ts the <code>Timestamp</code> value to compare with
     * @return <code>true</code> if the given <code>Timestamp</code>
     *         object is equal to this <code>Timestamp</code> object;
     *         <code>false</code> otherwise
     */
    public boolean equals(Timestamp ts) {
        if (super.equals(ts)) {
            if  (nanos == ts.nanos) {
                return true;
            } else {
                return false;
            }
        } else {
            return false;
        }
    }

    
Tests to see if this Timestamp object is
equal to the given object.
This version of the method equals has been added
to fix the incorrect
signature of Timestamp.equals(Timestamp) and to preserve backward
compatibility with existing class files.
Note: This method is not symmetric with respect to the
equals(Object) method in the base class.

Params:
  • ts – the Object value to compare with
Returns:true if the given Object is an instance
        of a Timestamp that
        is equal to this Timestamp object;
        false otherwise
/**
     * Tests to see if this <code>Timestamp</code> object is
     * equal to the given object.
     *
     * This version of the method <code>equals</code> has been added
     * to fix the incorrect
     * signature of <code>Timestamp.equals(Timestamp)</code> and to preserve backward
     * compatibility with existing class files.
     *
     * Note: This method is not symmetric with respect to the
     * <code>equals(Object)</code> method in the base class.
     *
     * @param ts the <code>Object</code> value to compare with
     * @return <code>true</code> if the given <code>Object</code> is an instance
     *         of a <code>Timestamp</code> that
     *         is equal to this <code>Timestamp</code> object;
     *         <code>false</code> otherwise
     */
    public boolean equals(java.lang.Object ts) {
      if (ts instanceof Timestamp) {
        return this.equals((Timestamp)ts);
      } else {
        return false;
      }
    }

    
Indicates whether this Timestamp object is
earlier than the given Timestamp object.

Params:
  • ts – the Timestamp value to compare with
Returns:true if this Timestamp object is earlier;
       false otherwise
/**
     * Indicates whether this <code>Timestamp</code> object is
     * earlier than the given <code>Timestamp</code> object.
     *
     * @param ts the <code>Timestamp</code> value to compare with
     * @return <code>true</code> if this <code>Timestamp</code> object is earlier;
     *        <code>false</code> otherwise
     */
    public boolean before(Timestamp ts) {
        return compareTo(ts) < 0;
    }

    
Indicates whether this Timestamp object is
later than the given Timestamp object.

Params:
  • ts – the Timestamp value to compare with
Returns:true if this Timestamp object is later;
       false otherwise
/**
     * Indicates whether this <code>Timestamp</code> object is
     * later than the given <code>Timestamp</code> object.
     *
     * @param ts the <code>Timestamp</code> value to compare with
     * @return <code>true</code> if this <code>Timestamp</code> object is later;
     *        <code>false</code> otherwise
     */
    public boolean after(Timestamp ts) {
        return compareTo(ts) > 0;
    }

    
Compares this Timestamp object to the given
Timestamp object.

Params:
  • ts –   the Timestamp object to be compared to
               this Timestamp object
Returns: the value 0 if the two Timestamp
         objects are equal; a value less than 0 if this
         Timestamp object is before the given argument;
         and a value greater than 0 if this
         Timestamp object is after the given argument.
Since:  1.4
/**
     * Compares this <code>Timestamp</code> object to the given
     * <code>Timestamp</code> object.
     *
     * @param   ts   the <code>Timestamp</code> object to be compared to
     *                this <code>Timestamp</code> object
     * @return  the value <code>0</code> if the two <code>Timestamp</code>
     *          objects are equal; a value less than <code>0</code> if this
     *          <code>Timestamp</code> object is before the given argument;
     *          and a value greater than <code>0</code> if this
     *          <code>Timestamp</code> object is after the given argument.
     * @since   1.4
     */
    public int compareTo(Timestamp ts) {
        long thisTime = this.getTime();
        long anotherTime = ts.getTime();
        int i = (thisTime<anotherTime ? -1 :(thisTime==anotherTime?0 :1));
        if (i == 0) {
            if (nanos > ts.nanos) {
                    return 1;
            } else if (nanos < ts.nanos) {
                return -1;
            }
        }
        return i;
    }

    
Compares this Timestamp object to the given
Date object.

Params:
  • o – the Date to be compared to
         this Timestamp object
Returns: the value 0 if this Timestamp object
         and the given object are equal; a value less than 0
         if this  Timestamp object is before the given argument;
         and a value greater than 0 if this
         Timestamp object is after the given argument.
Since:  1.5
/**
     * Compares this <code>Timestamp</code> object to the given
     * <code>Date</code> object.
     *
     * @param o the <code>Date</code> to be compared to
     *          this <code>Timestamp</code> object
     * @return  the value <code>0</code> if this <code>Timestamp</code> object
     *          and the given object are equal; a value less than <code>0</code>
     *          if this  <code>Timestamp</code> object is before the given argument;
     *          and a value greater than <code>0</code> if this
     *          <code>Timestamp</code> object is after the given argument.
     *
     * @since   1.5
     */
    public int compareTo(java.util.Date o) {
       if(o instanceof Timestamp) {
            // When Timestamp instance compare it with a Timestamp
            // Hence it is basically calling this.compareTo((Timestamp))o);
            // Note typecasting is safe because o is instance of Timestamp
           return compareTo((Timestamp)o);
      } else {
            // When Date doing a o.compareTo(this)
            // will give wrong results.
          Timestamp ts = new Timestamp(o.getTime());
          return this.compareTo(ts);
      }
    }

    
{@inheritDoc} The hashCode method uses the underlying java.util.Date implementation and therefore does not include nanos in its computation. 
/**
     * {@inheritDoc}
     *
     * The {@code hashCode} method uses the underlying {@code java.util.Date}
     * implementation and therefore does not include nanos in its computation.
     *
     */
    @Override
    public int hashCode() {
        return super.hashCode();
    }

    static final long serialVersionUID = 2745179027874758501L;

    private static final int MILLIS_PER_SECOND = 1000;

    
Obtains an instance of Timestamp from a LocalDateTime object, with the same year, month, day of month, hours, minutes, seconds and nanos date-time value as the provided LocalDateTime. 
 The provided LocalDateTime is interpreted as the local date-time in the local time zone. 
Params:
  • dateTime – a LocalDateTime to convert
Throws:
Returns:a Timestamp object
Since:1.8
/**
     * Obtains an instance of {@code Timestamp} from a {@code LocalDateTime}
     * object, with the same year, month, day of month, hours, minutes,
     * seconds and nanos date-time value as the provided {@code LocalDateTime}.
     * <p>
     * The provided {@code LocalDateTime} is interpreted as the local
     * date-time in the local time zone.
     *
     * @param dateTime a {@code LocalDateTime} to convert
     * @return a {@code Timestamp} object
     * @exception NullPointerException if {@code dateTime} is null.
     * @since 1.8
     */
    @SuppressWarnings("deprecation")
    public static Timestamp valueOf(LocalDateTime dateTime) {
        return new Timestamp(dateTime.getYear() - 1900,
                             dateTime.getMonthValue() - 1,
                             dateTime.getDayOfMonth(),
                             dateTime.getHour(),
                             dateTime.getMinute(),
                             dateTime.getSecond(),
                             dateTime.getNano());
    }

    
Converts this Timestamp object to a LocalDateTime. 
 The conversion creates a LocalDateTime that represents the same year, month, day of month, hours, minutes, seconds and nanos date-time value as this Timestamp in the local time zone. 
Returns:a LocalDateTime object representing the same date-time value
Since:1.8
/**
     * Converts this {@code Timestamp} object to a {@code LocalDateTime}.
     * <p>
     * The conversion creates a {@code LocalDateTime} that represents the
     * same year, month, day of month, hours, minutes, seconds and nanos
     * date-time value as this {@code Timestamp} in the local time zone.
     *
     * @return a {@code LocalDateTime} object representing the same date-time value
     * @since 1.8
     */
    @SuppressWarnings("deprecation")
    public LocalDateTime toLocalDateTime() {
        return LocalDateTime.of(getYear() + 1900,
                                getMonth() + 1,
                                getDate(),
                                getHours(),
                                getMinutes(),
                                getSeconds(),
                                getNanos());
    }

    
Obtains an instance of Timestamp from an Instant object. 
 Instant can store points on the time-line further in the future and further in the past than Date. In this scenario, this method will throw an exception. 
Params:
  • instant –  the instant to convert
Throws:
Returns:an Timestamp representing the same point on the time-line as the provided instant
Since:1.8
/**
     * Obtains an instance of {@code Timestamp} from an {@link Instant} object.
     * <p>
     * {@code Instant} can store points on the time-line further in the future
     * and further in the past than {@code Date}. In this scenario, this method
     * will throw an exception.
     *
     * @param instant  the instant to convert
     * @return an {@code Timestamp} representing the same point on the time-line as
     *  the provided instant
     * @exception NullPointerException if {@code instant} is null.
     * @exception IllegalArgumentException if the instant is too large to
     *  represent as a {@code Timesamp}
     * @since 1.8
     */
    public static Timestamp from(Instant instant) {
        try {
            Timestamp stamp = new Timestamp(instant.getEpochSecond() * MILLIS_PER_SECOND);
            stamp.nanos = instant.getNano();
            return stamp;
        } catch (ArithmeticException ex) {
            throw new IllegalArgumentException(ex);
        }
    }

    
Converts this Timestamp object to an Instant. 
 The conversion creates an Instant that represents the same point on the time-line as this Timestamp. 
Returns:an instant representing the same point on the time-line
Since:1.8
/**
     * Converts this {@code Timestamp} object to an {@code Instant}.
     * <p>
     * The conversion creates an {@code Instant} that represents the same
     * point on the time-line as this {@code Timestamp}.
     *
     * @return an instant representing the same point on the time-line
     * @since 1.8
     */
    @Override
    public Instant toInstant() {
        return Instant.ofEpochSecond(super.getTime() / MILLIS_PER_SECOND, nanos);
    }
}