How we can update the  System Date,in java

Hi guys,
can U pls help me...
How we can update the System Date,in java
I need to get the System Date and time continuosly thruogh threads concept.kindly help me
Thanking u in Advance

System.currentTimeMillis() will give you the current
system date and time as a long value.
~I think the OP wants to change the system time not just get the system time.

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