How to build start token for list getchanges?

Question

Using PnP JS for brevity. I am having major difficulty figuring out what date time format the following requires.

Use case: I have date time for my last cache, I want to get the differences in my list since then. Any help great appreciated.

const SOMEDATE= I have no idea  

const changeTokenStart = `1;3;${resource};${SOMEDATE};-1`;


const changeQuery: IChangeQuery = {
    Add: true,
    Update: true,
    Item: true,
    ChangeTokenEnd: null,
    ChangeTokenStart: { StringValue: changeTokenStart },
};

const r = await list.getChanges(changeQuery);

Answer 1

You can use date time in below format:

const SOMEDATE = new Date("2022-02-22").getTime();

const changeTokenStart = `1;3;${resource};${SOMEDATE};-1`;

Basically, you have to pass the number of milliseconds since January 1, 1970 00:00:00 - getTime() function returns the same

Documentation: Get changes on a list

Answer 2

According to my research and testing, please follow the following date time format:

const changeStart = new Date("2022-10-10").getTime();

Hope it can help you. Thanks for your understanding and support.