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.
@Deprecated
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.
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)
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.
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)
Sets this Timestamp object to represent a point in time that is time milliseconds after January 1, 1970 00:00:00 GMT.
setTime in class Date
time - the number of milliseconds.getTime(), Timestamp(long time), Calendar
public long getTime()
Returns the number of milliseconds since January 1, 1970, 00:00:00 GMT represented by this Timestamp object.
getTime in class Date
setTime(long)public static Timestamp valueOf(String s)
Converts a 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()
Formats a timestamp in JDBC timestamp escape format. yyyy-mm-dd hh:mm:ss.fffffffff, where ffffffffff indicates nanoseconds.
toString in class Date
String object in yyyy-mm-dd hh:mm:ss.fffffffff formatDate.toLocaleString(), Date.toGMTString()
public int getNanos()
Gets this Timestamp object's nanos value.
Timestamp object's fractional seconds componentsetNanos(int)public void setNanos(int n)
Sets this 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)
Tests to see if this 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)
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.
equals in class Date
ts - 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)
Indicates whether this 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)
Indicates whether this 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)
Compares this 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)
Compares this Timestamp object to the given Date object.
compareTo in interface Comparable<Date>
compareTo in class Date
o - 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()
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. hashCode in class Date
Object.equals(java.lang.Object), System.identityHashCode(java.lang.Object)
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.
dateTime - a LocalDateTime to convertTimestamp objectNullPointerException - if dateTime is null.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.
LocalDateTime object representing the same date-time valuepublic 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.
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
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.
toInstant in class Date
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