Why date calculations drive business logic in Google Sheets - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the formula to calculate the number of days between two dates in Google Sheets.

Google Sheets

=DATEDIF(A1, [1], "D")

Drag options to blanks, or click blank then click option'

AB1

BC1

CA2

DB2

Attempts:

3 left

💡 Hint

Common Mistakes

Using the same cell for both dates.

Using a text string instead of a cell reference.

Forgetting the unit "D" for days.

The DATEDIF function calculates the difference between two dates. Here, A1 is the start date and B1 is the end date. The "D" tells it to return the difference in days.

2fill in blank

medium

Complete the formula to add 30 days to a date in cell A1.

Google Sheets

=A1 [1] 30

Drag options to blanks, or click blank then click option'

A*

B+

C-

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Using minus instead of plus.

Using multiplication or division which changes the date incorrectly.

Adding 30 to a date adds 30 days. The plus sign + is used to add days to a date in Google Sheets.

3fill in blank

hard

Fix the error in the formula to calculate the number of months between two dates in A1 and B1.

Google Sheets

=DATEDIF(A1, B1, [1])

Drag options to blanks, or click blank then click option'

A"Y"

B"MD"

C"M"

D"D"

Attempts:

3 left

💡 Hint

Common Mistakes

Using "Y" which calculates years.

Using "D" which calculates days.

Using "MD" which calculates days ignoring months and years.

To calculate the number of full months between two dates, use "M" as the unit in DATEDIF. Other units calculate years, days, or days ignoring months and years.

4fill in blank

hard

Fill both blanks to create a formula that returns TRUE if the date in A1 is before today.

Google Sheets

=A1 [1] [2]()

Drag options to blanks, or click blank then click option'

A<

B>

CTODAY

DNOW

Attempts:

3 left

💡 Hint

Common Mistakes

Using > instead of <.

Using NOW() which includes time and may cause unexpected results.

The formula checks if the date in A1 is less than (<) today's date. TODAY() returns the current date without time.

5fill in blank

hard

Fill all three blanks to create a formula that calculates the number of weekdays between two dates in A1 and B1.

Google Sheets

=NETWORKDAYS([1], [2], [3])

Drag options to blanks, or click blank then click option'

AA1

BB1

CC1

DD1

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping start and end dates.

Leaving the holidays argument empty or incorrect.

Using cells that do not contain dates.

NETWORKDAYS counts weekdays between two dates. The first two arguments are the start and end dates (A1 and B1). The third argument is an optional range of holidays (C1) to exclude.

Practice

1. Why is it important to use date calculations in business spreadsheets?

easy

A. They are only useful for birthdays.

B. They help track deadlines and calculate durations automatically.

C. They slow down the spreadsheet performance.

D. They make the spreadsheet look colorful.

Solution

1. Step 1: Understand the role of dates in business

   Businesses often need to track deadlines, project durations, and schedules.

2. Step 2: Recognize how date calculations help

   Date calculations automate tracking and reduce manual errors, making management easier.

3. Final Answer:

   They help track deadlines and calculate durations automatically. -> Option B

4. Quick Check:

   Date calculations = track deadlines [OK]

Hint: Think about deadlines and schedules in daily work [OK]

Common Mistakes:

• Thinking dates only add colors
• Believing dates slow spreadsheets
• Assuming dates are for birthdays only

2. Which formula correctly calculates the number of days between two dates in Google Sheets?

easy

A. =DATEDIF(A1, B1, "D")

B. =SUM(A1, B1)

C. =A1+B1

D. =DATE(A1, B1)

Solution

1. Step 1: Identify the function for date difference

   The DATEDIF function calculates the difference between two dates in specified units.

2. Step 2: Check the syntax for days

   Using "D" as the third argument returns the difference in days.

3. Final Answer:

   =DATEDIF(A1, B1, "D") -> Option A

4. Quick Check:

   DATEDIF with "D" = days difference [OK]

Hint: Use DATEDIF with "D" to get days difference [OK]

Common Mistakes:

• Using SUM to add dates
• Adding dates directly with +
• Using DATE function incorrectly

3. Given the formula =TODAY()-A1 where A1 contains the date 2024-06-01 and today is 2024-06-10, what is the result?

medium

A. 10

B. Error

C. 1

D. 9

Solution

1. Step 1: Understand the TODAY() function

   TODAY() returns the current date, which is 2024-06-10 in this case.

2. Step 2: Calculate the difference

   Subtracting 2024-06-01 from 2024-06-10 gives 9 days.

3. Final Answer:

   9 -> Option D

4. Quick Check:

   2024-06-10 - 2024-06-01 = 9 [OK]

Hint: Subtract older date from newer date for days difference [OK]

Common Mistakes:

• Counting inclusive days incorrectly
• Assuming TODAY() returns date-time
• Expecting error from date subtraction

4. A user tries to calculate days between dates with =DATEDIF(A1, B1, "M") but gets an error. What is the likely cause?

medium

A. DATEDIF does not support "M" as unit.

B. The formula syntax is incorrect.

C. B1 date is earlier than A1 date.

D. Dates are not formatted as text.

Solution

1. Step 1: Check DATEDIF requirements

   DATEDIF requires the start date (A1) to be earlier or equal to the end date (B1).

2. Step 2: Understand error cause

   If B1 is earlier than A1, DATEDIF returns an error even if syntax is correct.

3. Final Answer:

   B1 date is earlier than A1 date. -> Option C

4. Quick Check:

   Start date must be before end date [OK]

Hint: Ensure start date ≤ end date in DATEDIF [OK]

Common Mistakes:

• Thinking "M" is invalid unit
• Assuming syntax error causes problem
• Not checking date order

5. You want to create a dynamic report that shows how many days remain until a project deadline in cell B2. Which formula should you use in cell C2 to update automatically each day?

hard

A. =B2 - TODAY()

B. =TODAY() - B2

C. =DATEDIF(TODAY(), B2, "Y")

D. =SUM(B2, TODAY())

Solution

1. Step 1: Understand the goal

   The formula should calculate days remaining, so deadline minus today.

2. Step 2: Choose correct formula

   =B2 - TODAY() subtracts current date from deadline, updating daily.

3. Step 3: Check other options

   Reversing the subtraction (=TODAY() - B2) shows past days, DATEDIF with "Y" calculates years instead of days, and SUM adds dates (invalid).

4. Final Answer:

   =B2 - TODAY() -> Option A

5. Quick Check:

   Deadline - Today = days remaining [OK]

Hint: Subtract TODAY() from deadline for days left [OK]

Common Mistakes:

• Reversing date subtraction
• Using years instead of days
• Adding dates instead of subtracting