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Class Timestamp

java.lang.Object

java.util.Date

java.sql.Timestamp

All Implemented Interfaces:: Serializable, Cloneable, Comparable<Date>

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.

Since:

1.1

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor

Description

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

Deprecated.
instead use the constructor Timestamp(long millis)

Timestamp(long time)

Constructs a Timestamp object using a milliseconds time value.
Method Summary

Modifier and Type

Method

Description

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(Timestamp ts)

Compares this Timestamp object to the given Timestamp object.

int

compareTo(Date o)

Compares this Timestamp object to the given Date object.

boolean

equals(Object ts)

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

boolean

equals(Timestamp ts)

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

static Timestamp

from(Instant instant)

Obtains an instance of Timestamp from an Instant 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.

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.

Instant

toInstant()

Converts this Timestamp object to an Instant.

LocalDateTime

toLocalDateTime()

Converts this Timestamp object to a LocalDateTime.

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.

static Timestamp

valueOf(LocalDateTime dateTime)

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.

Methods declared in class Date
after, before, clone, getDate, getDay, getHours, getMinutes, getMonth, getSeconds, getTimezoneOffset, getYear, parse, setDate, setHours, setMinutes, setMonth, setSeconds, setYear, toGMTString, toLocaleString, UTC

Methods declared in class Object
finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Details
- Timestamp
  
  @Deprecated(since="1.2") public Timestamp(int year, int month, int date, int hour, int minute, int second, int nano)
  
  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
- Timestamp
  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
Method Details
- setTime
  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.
  
  Overrides:
  
  setTime in class Date
  
  Parameters:
  
  time - the number of milliseconds.
  
  See Also:
  
  getTime()
  
  Timestamp(long time)
  
  Calendar
- getTime
  public long getTime()
  
  Returns the number of milliseconds since January 1, 1970, 00:00:00 GMT represented by this Timestamp object.
  
  Overrides:
  
  getTime in class Date
  
  Returns:
  
  the number of milliseconds since January 1, 1970, 00:00:00 GMT represented by this date.
  
  See Also:
  
  setTime(long)
- valueOf
  
  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...]
- toString
  public String toString()
  
  Formats a timestamp in JDBC timestamp escape format. yyyy-mm-dd hh:mm:ss.fffffffff, where fffffffff indicates nanoseconds.
  
  Overrides:
  
  toString in class Date
  
  Returns:
  
  a String object in yyyy-mm-dd hh:mm:ss.fffffffff format
  
  See Also:
  
  Date.toLocaleString()
  
  Date.toGMTString()
- getNanos
  public int getNanos()
  
  Gets this Timestamp object's nanos value.
  
  Returns:
  
  this Timestamp object's fractional seconds component
  
  See Also:
  
  setNanos(int)
- setNanos
  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()
- equals
  
  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
- equals
  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.
  
  Overrides:
  
  equals in class Date
  
  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
  
  See Also:
  
  Date.getTime()
- before
  
  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
- after
  
  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
- compareTo
  
  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.
  
  Since:
  
  1.4
- compareTo
  
  public int compareTo(Date o)
  
  Compares this Timestamp object to the given Date object.
  
  Specified by:
  
  compareTo in interface Comparable<Date>
  
  Overrides:
  
  compareTo in class Date
  
  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.
  
  Since:
  
  1.5
- hashCode
  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 Date.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.
  
  Overrides:
  
  hashCode in class Date
  
  Returns:
  
  a hash code value for this object.
  
  See Also:
  
  Object.equals(java.lang.Object)
  
  System.identityHashCode(Object)
- valueOf
  
  public static Timestamp valueOf(LocalDateTime dateTime)
  
  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.
  
  Parameters:
  
  dateTime - a LocalDateTime to convert
  
  Returns:
  
  a Timestamp object
  
  Throws:
  
  NullPointerException - if dateTime is null.
  
  Since:
  
  1.8
- toLocalDateTime
  
  public LocalDateTime toLocalDateTime()
  
  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
- from
  
  public static Timestamp from(Instant instant)
  
  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.
  
  Parameters:
  
  instant - the instant to convert
  
  Returns:
  
  an Timestamp representing the same point on the time-line as the provided instant
  
  Throws:
  
  NullPointerException - if instant is null.
  
  IllegalArgumentException - if the instant is too large to represent as a Timestamp
  
  Since:
  
  1.8
- toInstant
  
  public Instant toInstant()
  
  Converts this Timestamp object to an Instant.
  The conversion creates an Instant that represents the same point on the time-line as this Timestamp.
  
  Overrides:
  
  toInstant in class Date
  
  Returns:
  
  an instant representing the same point on the time-line
  
  Since:
  
  1.8

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Class Timestamp

Constructor Summary

Method Summary

Methods declared in class Date

Methods declared in class Object

Constructor Details

Timestamp

Timestamp

Method Details

setTime

getTime

valueOf

toString

getNanos

setNanos

equals

equals

before

after

compareTo

compareTo

hashCode

valueOf

toLocalDateTime

from

toInstant