How to highlight weekends [Conditional Formatting]
The image above shows conditional formatting applied to cell range C8:C20, it highlights cells containing dates that fall on Saturdays and Sundays.
Conditional formatting formula
How to apply conditional formatting to cell range C3:C20
 Select cell range C3:C20.
 Go to tab "Home" on the ribbon.
 Click the "Conditional Formatting" button.

Click "New Rule.." to open a dialog box.
 Click "Use a formula to determine which cells to format".
 Type the formula. (See above).
 Click "Format..." button and choose a formatting.
 Click OK button twice.
Explaining conditional formatting formula
Step 1  Identify day of the week
The WEEKDAY function returns 1 to 7 based on a date's day of the week, the second argument tells the function which day a week begins on. Using 2 as the second argument makes the week start on a Monday.
WEEKDAY(C3,2)
becomes
WEEKDAY(43101,2)
and returns 1.
The number calculated by the WEEKDAY function tells us which day of week a date is:
1  Monday
2  Tuesday
3  Wednesday
4  Thursday
5  Friday
6  Saturday
7  Sunday
Step 2  Check if the number is larger than 5
The larger than sign checks if the weekday function is larger than 5. If the number is larger than 5 then it must be a Saturday or Sunday, see list above.
WEEKDAY(C3,2)>5
becomes
1>5 and returns FALSE.
Step 3  Boolean value determines if the cell is highlighted
If the logical expression returns TRUE then the cell is highlighted and FALSE nothing happens.
How to highlight record when a date falls on a weekend
Conditional formatting formula applied to cell range B3:D20
This formula is almost as the first formula, except there is a dollar sign in front of the B (column number). This makes the column absolute meaning the cell reference doesn't change when the Conditional Formatting moves to the next column. It only changes when it moves to a new row.
Example,
Cell  Formula 
B3  =WEEKDAY($B3,2)>5 
C3  =WEEKDAY($B3,2)>5 
D3  =WEEKDAY($B3,2)>5 
B4  =WEEKDAY($B4,2)>5 
C4  =WEEKDAY($B4,2)>5 
D4  =WEEKDAY($B4,2)>5 
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