How to get the Week data in daypilot datepicker if we select any date?

You can switch the date picker to "week" mode when it selects a week automatically. Please see my answer here:

https://forums.daypilot.org/question/5812/how-to-create-the-week-wise-date-picker-in-scheduler

You can also get the start and end date of the corresponding week for any DayPilot.Date object using the firstDayOfWeek() method:

https://api.daypilot.org/daypilot-date-firstdayofweek/

const day = new DayPilot.Date("2022-09-02");
const start = day.firstDayOfWeek();
const end = start.addDays(7);