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.
| Constructor and 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. |
| Modifier and Type | Method and 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(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(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(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. |
static Timestamp |
valueOf(String s)
Converts a
String object in JDBC timestamp escape format to a
Timestamp value. |
after, before, clone, getDate, getDay, getHours, getMinutes, getMonth, getSeconds, getTimezoneOffset, getYear, parse, setDate, setHours, setMinutes, setMonth, setSeconds, setYear, toGMTString, toLocaleString, UTC@Deprecated public Timestamp(int year, int month, int date, int hour, int minute, int second, int nano)
Timestamp(long millis)Timestamp object initialized
with the given values.year - the year minus 1900month - 0 to 11date - 1 to 31hour - 0 to 23minute - 0 to 59second - 0 to 59nano - 0 to 999,999,999IllegalArgumentException - if the nano argument is out of boundspublic Timestamp(long time)
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.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.Calendarpublic void setTime(long time)
Timestamp object to represent a point in time that is
time milliseconds after January 1, 1970 00:00:00 GMT.setTime in class Datetime - the number of milliseconds.getTime(),
Timestamp(long time),
Calendarpublic long getTime()
Timestamp object.getTime in class DatesetTime(long)public static Timestamp valueOf(String s)
String object in JDBC timestamp escape format to a
Timestamp value.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.Timestamp valueIllegalArgumentException - if the given argument
does not have the format yyyy-[m]m-[d]d hh:mm:ss[.f...]public String toString()
yyyy-mm-dd hh:mm:ss.fffffffff,
where ffffffffff indicates nanoseconds.
toString in class DateString object in
yyyy-mm-dd hh:mm:ss.fffffffff formatDate.toLocaleString(),
Date.toGMTString()public int getNanos()
Timestamp object's nanos value.Timestamp object's fractional seconds componentsetNanos(int)public void setNanos(int n)
Timestamp object's nanos field
to the given value.n - the new fractional seconds componentIllegalArgumentException - if the given argument
is greater than 999999999 or less than 0getNanos()public boolean equals(Timestamp ts)
Timestamp object is
equal to the given Timestamp object.ts - the Timestamp value to compare withtrue if the given Timestamp
object is equal to this Timestamp object;
false otherwisepublic boolean equals(Object ts)
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.equals in class Datets - the Object value to compare withtrue if the given Object is an instance
of a Timestamp that
is equal to this Timestamp object;
false otherwiseDate.getTime()public boolean before(Timestamp ts)
Timestamp object is
earlier than the given Timestamp object.ts - the Timestamp value to compare withtrue if this Timestamp object is earlier;
false otherwisepublic boolean after(Timestamp ts)
Timestamp object is
later than the given Timestamp object.ts - the Timestamp value to compare withtrue if this Timestamp object is later;
false otherwisepublic int compareTo(Timestamp ts)
Timestamp object to the given
Timestamp object.ts - the Timestamp object to be compared to
this Timestamp object0 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 int compareTo(Date o)
Timestamp object to the given
Date object.compareTo in interface Comparable<Date>compareTo in class Dateo - the Date to be compared to
this Timestamp object0 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 hashCode()
Date.getTime()
method. That is, the hash code is the value of the expression:
The(int)(this.getTime()^(this.getTime() >>> 32))
hashCode method uses the underlying java.util.Date
implementation and therefore does not include nanos in its computation.hashCode in class DateObject.equals(java.lang.Object),
System.identityHashCode(java.lang.Object)public static Timestamp valueOf(LocalDateTime dateTime)
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.
dateTime - a LocalDateTime to convertTimestamp objectNullPointerException - if dateTime is null.public LocalDateTime toLocalDateTime()
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.
LocalDateTime object representing the same date-time valuepublic static Timestamp from(Instant instant)
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.
instant - the instant to convertTimestamp representing the same point on the time-line as
the provided instantNullPointerException - if instant is null.IllegalArgumentException - if the instant is too large to
represent as a Timesamp Submit a bug or feature
For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
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