The day doesn't match the date.

All days and months re-occur and repeat.

Months and Years having Monday the 26th

Time and Date https://www.timeanddate.com > weekday-monday-26
Year Date Month Since last Comment 2010 Monday, April 26, 2010 April 2 times in year 2010 2010 Monday, July 26, 2010 July + 3 months 2011 Monday, September 26, 2011 September + 14 months 2 times in year 2011 View 67 more rows

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  Months and Years having Monday the 26th

  https://www.timeanddate.com > weekday-monday-26
  Monday, December 26, 2022, December, + 3 months. 2023, Monday, June 26, 2023, June, + 6 months, 1 time in year 2023. 2024, Monday, February 26, 2024 ...
  
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The year may be wrong, in 2002 the day and date match

if just time is off by one to three hour(s) , you need to ck your time zone settings , if the day is off by one day you need to wait 24hrs keeping watch in a good view of the sky (not locked in a metal box) it should auto correct itself to proper day when it receives the radio signal for two time cycles (24hrs)

check you have set to the correct year, and remember a leap year has one day more... note date,month stays the same but the day changes from year to year.. hope your clock has a year function?

Harlyn,
Have you checked the year also. That is the only item you have not mentioned. If the year is wrong then the day may be wrong. So, you must set the time, date, month and the year, then only would you get the correct day.

Hello. Contact DKNY customer service and request an instruction manual http://www.dkny.com/contact/index.php

Press the clock set on your Sharp first blink hour after that minute and then blink the days with - button you change the day in monday.

Yourl calendar year may be wrong. If the calendar needs to be reset hold down the month/date & time buttons. Press the up or down button based on you have to baclward or forward.

My Solution for Mitsubishi HS-U500 VCR setting the date for 2008 and beyond:
I had same problem with this old unit as everyone else has.  Since the year really doesn't matter (except maybe when you're setting to tape near a new year), here's how to get the day and dates correct:
On the remote, push Menu button, then select "First time setup", then select "Set the Clock", then select the month.  Now, start adjusting the YEAR and watch how the "days" change with the years.  Adjust the years so that the "Day" (Monday, Tuesday, etc.) matches the date (1,2, 22, 23, 28, etc.) in the month.  Then cycle thru the rest of the items and get out by hitting menu button again.  
That's it!  That's my quicky solution.  Caveat: This may not be permanent with leap years and the like, so you may need to check it from time to time to make sure the days match up with the dates.  But you can do this when you go to set up for timed taping.  Hope that "FIXes" it for "Ya"!