[APL (Dyalog Unicode)] 18.0 beta, 19 bytes

Full program, taking no input.

'Dddd'(1200⌶)⍳7

Returns a list of strings:

┌──────┬───────┬─────────┬────────┬──────┬────────┬──────┐
│Monday│Tuesday│Wednesday│Thursday│Friday│Saturday│Sunday│
└──────┴───────┴─────────┴────────┴──────┴────────┴──────┘

⍳7 Integers 1...7, representing the dates Jan 1–7

(1200⌶) Format Date-time ("12:00") as follows:

'Dddd' long Day name [APL (Dyalog Unicode)]: https://www.dyalog.com/

[APL (Dyalog Unicode)] 18.0 beta, 19 bytes

Full program, taking no input.

'Dddd'(1200⌶)⍳7

Returns a list of strings:

┌──────┬───────┬─────────┬────────┬──────┬────────┬──────┐
│Monday│Tuesday│Wednesday│Thursday│Friday│Saturday│Sunday│
└──────┴───────┴─────────┴────────┴──────┴────────┴──────┘

⍳7 Integers 1...7, representing the dates Jan 1–7, 1900

(1200⌶) Format Date-time ("12:00") as follows:

'Dddd' long Day name [APL (Dyalog Unicode)]: https://www.dyalog.com/

APL (Dyalog Unicode) 18.0 beta, 19 bytes

'Dddd'(1200⌶)⍳7

Try it online! Returns a list of strings:

┌──────┬───────┬─────────┬────────┬──────┬────────┬──────┐
│Monday│Tuesday│Wednesday│Thursday│Friday│Saturday│Sunday│
└──────┴───────┴─────────┴────────┴──────┴────────┴──────┘

[APL (Dyalog Unicode)] 18.0 beta, 19 bytes

Full program, taking no input.

'Dddd'(1200⌶)⍳7

Returns a list of strings:

┌──────┬───────┬─────────┬────────┬──────┬────────┬──────┐
│Monday│Tuesday│Wednesday│Thursday│Friday│Saturday│Sunday│
└──────┴───────┴─────────┴────────┴──────┴────────┴──────┘

⍳7 Integers 1...7, representing the dates Jan 1–7

(1200⌶)Format Date-time ("12:00") as follows:

'Dddd' long Day name [APL (Dyalog Unicode)]: https://www.dyalog.com/