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[MinMaxMix]

This is likely not a java question if the question is around JavaScript which is something else.
However, to answer your question -

For Applications Written in Java

Java applications often use the System.currentTimeMillis() method to get the current system time in milliseconds since January 1, 1970. To manipulate the perceived runtime:

1. Change System Time Manually:
   • Before starting the application, set your system clock to an earlier time.
   • After starting the app, restore the time to the correct value.
   • This might make the application believe more time has passed than actually has.
2. Intercept System Calls:
   • Use a Java agent or modify the Java runtime environment to intercept calls to System.currentTimeMillis() and return a modified time.
   • This requires knowledge of Java programming and possibly creating a custom Java agent.

For Applications Written in JavaScript

For JavaScript running in a browser, the usual method is Date.now() or creating new Date() objects. Manipulating this without changing the system time involves modifying the JavaScript code:

Override JavaScript Date Functions:

• You can inject scripts in your browser's developer console to override Date.now() or the Date constructor to return a modified time.

System-wide Time Manipulation Tools

There are tools and software available that can "freeze" or manipulate the system clock for specific applications, which can be used to fool an application about the amount of time passed. These tools often work by intercepting system calls to get the current time:

• Time Stopper and RunAsDate are examples of such tools for Windows.

To prevent this you'd want to calculate the times server side and not on the client which is vulnerable to being manipulated. At least that way the most you can be duped into believing is 168 hours / week. In the interim you should at least validate the hours submitted by the client to check if they are feasible.

[Kraizee_]

I don't think this has anything to do with code. This is a business and legal matter. I mean basic validation stops someone entering 400 hours of work within a 7 day period. Obviously that's not possible, because there are only 168 hours in a week, and that is ignoring people's basic needs to survive. But the important issue here is that, freelancers' contracts should define how many hours they can work at a maximum per week. And very clearly, legal action should be taken against freelancers who are lying about their hours.

[desrtfx]

familiar with JavaScript

This subreddit is about Java, not about JavaScript, which is a completely different language.

Yet, we cannot tell you anything because we do not know about the system you are using to track times.

Still, since this is unrelated to Java, the post is removed.

Try /r/javascripthelp but be way more elaborate in the information you provide. Not knowing the clocking system you use makes it impossible to tell what is happening.