Timestamp

public class Timestamp extends Date

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.

Public Constructor Summary

	Timestamp(int year, int month, int date, int hour, int minute, int second, int nano) This constructor is deprecated. instead use the constructor Timestamp(long millis)
	Timestamp(long time) Constructs a Timestamp object using a milliseconds time value.

Public Method Summary

boolean	after(Timestamp ts) Indicates whether this Timestamp object is later than the given Timestamp object.
boolean	before(Timestamp ts) Indicates whether this Timestamp object is earlier than the given Timestamp object.
int	compareTo(Date o) Compares this Timestamp object to the given Date object.
int	compareTo(Timestamp ts) Compares this Timestamp object to the given Timestamp object.
boolean	equals(Timestamp ts) Tests to see if this Timestamp object is equal to the given Timestamp object.
boolean	equals(Object ts) Tests to see if this Timestamp object is equal to the given object.
int	getNanos() Gets this Timestamp object's nanos value.
long	getTime() Returns the number of milliseconds since January 1, 1970, 00:00:00 GMT represented by this Timestamp object.
int	hashCode() Returns a hash code value for this object. The hashCode method uses the underlying java.util.Date implementation and therefore does not include nanos in its computation.
void	setNanos(int n) Sets this Timestamp object's nanos field to the given value.
void	setTime(long time) Sets this Timestamp object to represent a point in time that is time milliseconds after January 1, 1970 00:00:00 GMT.
String	toString() Formats a timestamp in JDBC timestamp escape format.
static Timestamp	valueOf(String s) Converts a String object in JDBC timestamp escape format to a Timestamp value.

Inherited Method Summary

From class java.util.Date

static long	UTC(int year, int month, int date, int hrs, int min, int sec) This method is deprecated. As of JDK version 1.1, replaced by Calendar.set(year + 1900, month, date, hrs, min, sec) or GregorianCalendar(year + 1900, month, date, hrs, min, sec), using a UTC TimeZone, followed by Calendar.getTime().getTime().
boolean	after(Date when) Tests if this date is after the specified date.
boolean	before(Date when) Tests if this date is before the specified date.
Object	clone() Return a copy of this object.
int	compareTo(Date anotherDate) Compares two Dates for ordering.
boolean	equals(Object obj) Compares two dates for equality.
int	getDate() This method is deprecated. As of JDK version 1.1, replaced by Calendar.get(Calendar.DAY_OF_MONTH).
int	getDay() This method is deprecated. As of JDK version 1.1, replaced by Calendar.get(Calendar.DAY_OF_WEEK).
int	getHours() This method is deprecated. As of JDK version 1.1, replaced by Calendar.get(Calendar.HOUR_OF_DAY).
int	getMinutes() This method is deprecated. As of JDK version 1.1, replaced by Calendar.get(Calendar.MINUTE).
int	getMonth() This method is deprecated. As of JDK version 1.1, replaced by Calendar.get(Calendar.MONTH).
int	getSeconds() This method is deprecated. As of JDK version 1.1, replaced by Calendar.get(Calendar.SECOND).
long	getTime() Returns the number of milliseconds since January 1, 1970, 00:00:00 GMT represented by this Date object.
int	getTimezoneOffset() This method is deprecated. As of JDK version 1.1, replaced by -(Calendar.get(Calendar.ZONE_OFFSET) + Calendar.get(Calendar.DST_OFFSET)) / (60 * 1000).
int	getYear() This method is deprecated. As of JDK version 1.1, replaced by Calendar.get(Calendar.YEAR) - 1900.
int	hashCode() Returns a hash code value for this object.
static long	parse(String s) This method is deprecated. As of JDK version 1.1, replaced by DateFormat.parse(String s).
void	setDate(int date) This method is deprecated. As of JDK version 1.1, replaced by Calendar.set(Calendar.DAY_OF_MONTH, int date).
void	setHours(int hours) This method is deprecated. As of JDK version 1.1, replaced by Calendar.set(Calendar.HOUR_OF_DAY, int hours).
void	setMinutes(int minutes) This method is deprecated. As of JDK version 1.1, replaced by Calendar.set(Calendar.MINUTE, int minutes).
void	setMonth(int month) This method is deprecated. As of JDK version 1.1, replaced by Calendar.set(Calendar.MONTH, int month).
void	setSeconds(int seconds) This method is deprecated. As of JDK version 1.1, replaced by Calendar.set(Calendar.SECOND, int seconds).
void	setTime(long time) Sets this Date object to represent a point in time that is time milliseconds after January 1, 1970 00:00:00 GMT.
void	setYear(int year) This method is deprecated. As of JDK version 1.1, replaced by Calendar.set(Calendar.YEAR, year + 1900).
String	toGMTString() This method is deprecated. As of JDK version 1.1, replaced by DateFormat.format(Date date), using a GMT TimeZone.
String	toLocaleString() This method is deprecated. As of JDK version 1.1, replaced by DateFormat.format(Date date).
String	toString() Converts this Date object to a String of the form: dow mon dd hh:mm:ss zzz yyyy where: dow is the day of the week (Sun, Mon, Tue, Wed, Thu, Fri, Sat).

From class java.lang.Object

Object	clone() Creates and returns a copy of this Object.
boolean	equals(Object obj) Compares this instance with the specified object and indicates if they are equal.
void	finalize() Invoked when the garbage collector has detected that this instance is no longer reachable.
final Class<?>	getClass() Returns the unique instance of Class that represents this object's class.
int	hashCode() Returns an integer hash code for this object.
final void	notify() Causes a thread which is waiting on this object's monitor (by means of calling one of the wait() methods) to be woken up.
final void	notifyAll() Causes all threads which are waiting on this object's monitor (by means of calling one of the wait() methods) to be woken up.
String	toString() Returns a string containing a concise, human-readable description of this object.
final void	wait(long timeout, int nanos) Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object or until the specified timeout expires.
final void	wait(long timeout) Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object or until the specified timeout expires.
final void	wait() Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object.

From interface java.lang.Comparable

abstract int

compareTo(Date o) Compares this object with the specified object for order.

Public Constructors

public Timestamp (int year, int month, int date, int hour, int minute, int second, int nano)

This constructor is deprecated.
instead use the constructor Timestamp(long millis)

Constructs a Timestamp object initialized with the given values.

Parameters

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

IllegalArgumentException	if the nano argument is out of bounds

public Timestamp (long time)

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.

Parameters

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

• Calendar

Public Methods

public boolean after (Timestamp ts)

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

Parameters

ts	the Timestamp value to compare with

Returns

• true if this Timestamp object is later; false otherwise

public boolean before (Timestamp ts)

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

Parameters

ts	the Timestamp value to compare with

Returns

• true if this Timestamp object is earlier; false otherwise

public int compareTo (Date o)

Compares this Timestamp object to the given Date object.

Parameters

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.

public int compareTo (Timestamp ts)

Compares this Timestamp object to the given Timestamp object.

Parameters

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.

public boolean equals (Timestamp ts)

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

Parameters

ts	the Timestamp value to compare with

Returns

• true if the given Timestamp object is equal to this Timestamp object; false otherwise

public boolean equals (Object ts)

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.

Parameters

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

public int getNanos ()

Gets this Timestamp object's nanos value.

Returns

• this Timestamp object's fractional seconds component

See Also

• setNanos(int)

public long getTime ()

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

Returns

• the number of milliseconds since January 1, 1970, 00:00:00 GMT represented by this date.

See Also

• setTime(long)

public int hashCode ()

Returns a hash code value for this object. The result is the exclusive OR of the two halves of the primitive long value returned by the getTime() method. That is, the hash code is the value of the expression:

(int)(this.getTime()^(this.getTime() >>> 32))
 

The hashCode method uses the underlying java.util.Date implementation and therefore does not include nanos in its computation.

Returns

• a hash code value for this object.

public void setNanos (int n)

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

Parameters

n	the new fractional seconds component

Throws

IllegalArgumentException	if the given argument is greater than 999999999 or less than 0

See Also

• getNanos()

public void setTime (long time)

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

Parameters

time	the number of milliseconds.

See Also

• getTime()
• Timestamp(long)
• Calendar

public String toString ()

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

public static Timestamp valueOf (String s)

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

Parameters

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.

Returns

• corresponding Timestamp value

Throws

IllegalArgumentException	if the given argument does not have the format yyyy-[m]m-[d]d hh:mm:ss[.f...]