I am trying to always set A) and B) below with dates on page load based on todays date. It needs to be in this date format.   Monday to Monday

Todays date is:  2026-03-23

A ) This week  starting Monday date. ( Todays date)
<input type="hidden" class ="thisweek" value="2026-03-23">

B) + 7 days  from 26th below ( Monday)
<input type="hidden" class ="nextweek"  value="2026-03-26">

C) + 21 days starting Monday date.
Bases on Below needs to auto calculate the  and display 
<input type="hidden" class ="nextdate1" value="2026-03-23">

D) + 28 days starting Monday date.
<input type="hidden" class ="nextdate2" value="2026-03-23">

E) - 7 days from  (Todays date) starting Monday
<input type="hidden" class ="prevdate1" value="2026-03-23">

F) -14 days from  ( Todays date) starting Monday
<input type="hidden" class ="prevdate2" value="2026-03-23">