How to put date automatically for whole month

[kalpeshkansara]

I have worksheet of employees for salary sheet calculations.

This worksheet have date format need to get every month dates automatically which currently put manually.
also days put from past link of whole date each cell's same value to left side of every dates and changed its format to show only days so its showing days only. but wanted to do color red in every Sundays which is not able to apply by conditional formatting to do red color on days for "Sun".

What to do I don't understand for the dates.
Help me if you have any formulas for automatic dates and for days need red color in every Sun.

Waiting for reply

 

[Legacy 421546]

First date of the month:
https://www.extendoffice.com/documents/excel/3888-excel-set-date-to-first-of-month.html
Color a day:
https://www.dummies.com/software/microsoft-office/excel/how-to-highlight-weekend-dates-in-excel/

 

[kalpeshkansara]

Its working but date we have to take from each cells of left a2, a3, a4... but not like this.

I have to enter only one time that new month starts like Jul/2019 at B2 and by this whole date will come automatically in respective rows.