The java time clock class provides access to the current instant date and time using a time zone.
Wall clock time java.
The current date and time depend on the time zone and for globalized applications a time provider is necessary to ensure that the date and time are created with the correct time zone.
Following is the declaration for java io clock class.
Changing the system time can affect the results or a leap second will disrupt the result.
Nanosecond and second fields of the clock are set to zero to round the instant in the whole minute.
However the result may and will be inaccurate as system currenttimemillis measures wall clock time.
Java time clock tickminutes zoneid zone method is a static method of clock class that returns the current instant ticking in whole minutes using the best available system clock and the time zone of that instant is same as the time zone passed as a parameter.
Java time clock system zoneid zone method is a static method of clock class which returns a clock that returns the current instant of the clock using best available system clock with zoneid of the returned clock is set to the zoneid passed.
For example the value 13 45 30 123456789 can be stored in a localtime.
A clock providing access to the current instant date and time using a time zone.
Instances of this class are used to find the current instant which can be interpreted using the stored time zone to find the current date and time.
Time elapsed is the difference between these two values.
Clock was added in java 8 and provides access to an instant in time using the best available system clock and to be used as a time provider which can be effectively stubbed for testing purposes.
This class does not store or represent a date or time zone.
Localtime is an immutable date time object that represents a time often viewed as hour minute second.
Public abstract class clock extends object class constructors.
As such a clock can be used instead of system currenttimemillis and timezone getdefault.
Use of a clock is.
Time is represented to nanosecond precision.
Wall clock time may change for many reasons e g.
A time without a time zone in the iso 8601 calendar system such as 10 15 30.
This method can use system currenttimemillis or other higher resolution clock if the clock is available to use.