【Requirements for new features】Modifying and customizing the base time （which is always the current time now）

[jianshuod]

As depicted in the title, users may want to assign the base time by themselves.
One user case is that I know about the early-rejection time and I may make plans for the incoming conferences. It is convenient to set the base time to the early-reject time.

[jacklightChen]

Reasonable and valuable, we plan to add this feature in the near future.