DATE function construction in Excel - Practice Problems & Coding Challenges

Challenge - 5 Problems

📊 Formula Result

intermediate

Calculate the date for the 15th day of the 3rd month in 2025

Which formula correctly returns the date March 15, 2025?

A =DATE(15,3,2025)

B =DATE(3,15,2025)

C =DATE(2025,15,3)

D =DATE(2025,3,15)

💡 Hint

Remember the DATE function order is YEAR, MONTH, DAY.

The DATE function takes the year first, then month, then day. Only option D follows this order correctly.

📊 Formula Result

intermediate

Find the date 10 days after January 25, 2024

Which formula returns the date February 4, 2024?

A =DATE(2024,2,4)

B =DATE(2024,1,35)

C =DATE(2024,1,25)+10

D =DATE(2024,1,25-10)

💡 Hint

Adding days to a date can be done by simple addition.

Adding 10 to the date January 25, 2024, results in February 4, 2024. Option C adds 10 days correctly.

❓ Function Choice

advanced

Choose the formula that returns the last day of February in a leap year

Which formula returns February 29, 2020?

A =DATE(2020,2,29)

B =DATE(2020,3,0)

C =DATE(2020,2,28)+1

D =DATE(2020,2,30)

💡 Hint

Using day 0 of the next month returns the last day of the previous month.

In Excel, day 0 of March 2020 is February 29, 2020, the last day of February in a leap year. Option B uses this trick correctly.

📊 Formula Result

advanced

Calculate the date 45 days before April 10, 2023

Which formula returns the date February 24, 2023?

A =DATE(2023,4,10)-45

B =DATE(2023,4,10)+45

C =DATE(2023,2,24)

D =DATE(2023,3,26)

💡 Hint

Subtract days by simple subtraction from the date.

Subtracting 45 days from April 10, 2023, results in February 24, 2023. Option A does this correctly.

🎯 Scenario

expert

Determine the weekday of the first day of the current year

Given the current year is 2024, which formula returns the weekday number of January 1, 2024, where Sunday=1 and Saturday=7?

A =WEEKDAY(DATE(2024,1,1),1)

B =WEEKDAY(DATE(2024,1,1),2)

C =WEEKDAY(DATE(2024,1,1),3)

D =WEEKDAY(DATE(2024,1,1))

💡 Hint

Check the WEEKDAY function's return type to match Sunday=1.

The WEEKDAY function with return_type 1 returns Sunday as 1 and Saturday as 7. Option A uses this correctly.

Practice

1. What does the Excel function =DATE(2024, 5, 10) return?

easy

A. Error because of wrong syntax

B. October 5, 2024

C. 2024-05-10 as text

D. May 10, 2024

Solution

1. Step 1: Understand the DATE function parameters

   The DATE function takes year, month, and day in that order: DATE(year, month, day).

2. Step 2: Interpret the given values

   Year is 2024, month is 5 (May), and day is 10, so the date is May 10, 2024.

3. Final Answer:

   May 10, 2024 -> Option D

4. Quick Check:

   DATE(2024,5,10) = May 10, 2024 [OK]

Hint: Remember DATE(year, month, day) builds a real date [OK]

Common Mistakes:

• Confusing month and day order
• Expecting text output instead of date
• Thinking DATE returns an error for normal inputs

2. Which of these is the correct syntax to create a date for December 25, 2023 in Excel?

easy

A. =DATE(2023, 25, 12)

B. =DATE(2023, 12, 25)

C. =DATE(12, 25, 2023)

D. =DATE(25, 12, 2023)

Solution

1. Step 1: Recall DATE function parameter order

   DATE requires year, then month, then day in that order.

2. Step 2: Match parameters to December 25, 2023

   Year = 2023, month = 12 (December), day = 25, so syntax is DATE(2023, 12, 25).

3. Final Answer:

   =DATE(2023, 12, 25) -> Option B

4. Quick Check:

   Correct parameter order = =DATE(2023, 12, 25) [OK]

Hint: DATE is always DATE(year, month, day) [OK]

Common Mistakes:

• Swapping month and day positions
• Using day as month or vice versa
• Putting year last

3. What is the result of =DATE(2024, 14, 5) in Excel?

medium

A. December 5, 2024

B. Error because month 14 is invalid

C. February 5, 2025

D. January 5, 2024

Solution

1. Step 1: Understand how DATE handles months > 12

   Excel adds extra months to the year. Month 14 means 12 months + 2 months, so it moves 1 year ahead plus 2 months.

2. Step 2: Calculate the adjusted date

   Starting from January 2024, adding 14 months moves to February 2025. Day remains 5.

3. Final Answer:

   February 5, 2025 -> Option C

4. Quick Check:

   DATE(2024,14,5) = Feb 5, 2025 [OK]

Hint: Months >12 add to year automatically [OK]

Common Mistakes:

• Expecting an error for month > 12
• Not adding extra months to year
• Confusing month and day

4. You entered =DATE(2023, 2, 30) but Excel shows March 2, 2023. Why?

medium

A. Excel treats day 30 in February as March 2 automatically

B. Formula syntax is wrong, so Excel guesses the date

C. February always has 30 days in Excel

D. Excel shows an error, not March 2

Solution

1. Step 1: Understand how DATE handles invalid days

   If the day number is too large for the month, Excel adds the extra days to the next month.

2. Step 2: Calculate the adjusted date for February 30

   February 2023 has 28 days, so day 30 is 2 days after Feb 28, which is March 2, 2023.

3. Final Answer:

   Excel treats day 30 in February as March 2 automatically -> Option A

4. Quick Check:

   DATE(2023,2,30) = Mar 2, 2023 [OK]

Hint: DATE auto-adjusts days beyond month length [OK]

Common Mistakes:

• Expecting error for invalid day
• Thinking February has 30 days
• Assuming wrong formula syntax

5. You want to calculate the date 45 days after January 20, 2024 by adding to the day parameter inside DATE. Which formula correctly does this?

hard

A. =DATE(2024, 1, 20 + 45)

B. =DATE(2024, 1 + 45, 20)

C. =DATE(2024, 1, 20) + 45

D. =DATE(2024, 1, 20) - 45

Solution

1. Step 1: Understand how DATE handles day overflow

   Adding 45 to the day parameter in DATE will automatically adjust the month and year as needed.

2. Step 2: Check each option

   =DATE(2024, 1, 20 + 45) adds 45 to day inside DATE, which works. =DATE(2024, 1 + 45, 20) adds 45 to month, which is incorrect. =DATE(2024, 1, 20) + 45 adds 45 to a date serial number, which works but is not using DATE construction. =DATE(2024, 1, 20) - 45 subtracts 45 days, which is wrong.

3. Final Answer:

   =DATE(2024, 1, 20 + 45) -> Option A

4. Quick Check:

   DATE(2024,1,65) = Mar 5, 2024 [OK]

Hint: Add days inside DATE day parameter to auto-adjust [OK]

Common Mistakes:

• Adding days to month instead of day
• Adding days outside DATE function
• Subtracting days instead of adding