Date and deadline formula example

What does this template do?

Learn calendar-date subtraction and completion-aware overdue formulas using a fixed review date.

Days remaining equals due date less review date. Days overdue is positive only for incomplete items whose due date has passed. Both formulas reference B7 instead of TODAY.

Date differences are calendar days and exclude no holidays or weekends. A fixed review date makes examples reproducible; change it deliberately when reviewing a new period.

The working tab keeps editable inputs separate from formulas, with room for 60 records. The Notes tab explains the method and how to extend the range. All example records are fictional and can be replaced. Download a workbook format to retain formulas, or CSV when you need calculated values only.

What’s inside

Days remaining equals due date less review date. Days overdue is positive only for incomplete items whose due date has passed. Both formulas reference B7 instead of TODAY.
60 prepared record rows with blank-row guards
Blue input cells, typed dates and numbers, and frozen column headers
Notes with the method, assumptions, and range-extension instructions

Which tabs does the workbook have?

Tab	What it holds
Worksheet	Learn calendar-date subtraction and completion-aware overdue formulas using a fixed review date.
Notes	How to use the workbook, formula method, assumptions, and file format limits.

What formulas does this template use?

This template holds 122 formulas in 160 cells across 2 tabs, so 76% of its cells calculate. They use 7 distinct functions; the longest formula is 101 characters.

Function	Uses	What it does
`IF`	361	one result when a test is true, another when false
`ISNUMBER`	120	true for a number
`NOT`	120	reverses true and false
`MAX`	60	largest value
`OR`	60	true when any test is true
`COUNTIF`	2	counts cells meeting one condition
`COUNTA`	1	counts non-empty cells

Counted from the workbook itself. Only functions that Excel, LibreOffice Calc, Google Sheets and Apple Numbers evaluate the same way are used, so the formulas survive every download format.

How do you use it?

Replace the fictional records in blue cells with your own data. Keep the dark formula cells.
Set the review date in B7 for date calculations.
Read the calculated columns and inspect the results before using them. Clear unused input rows; keep their formulas.
The prepared range holds 60 records in rows 11–70. Extend formulas and summary ranges together if you add more rows.

What is it good for?

Learn calendar-date subtraction and completion-aware overdue formulas using a fixed review date
Replacing the labeled fictional records with your own figures
Checking a calculation before adapting it to a larger workbook

Questions about this sheet

How is the result calculated?

Days remaining equals due date less review date. Days overdue is positive only for incomplete items whose due date has passed. Both formulas reference B7 instead of TODAY.

What assumptions should I check?

Date differences are calendar days and exclude no holidays or weekends. A fixed review date makes examples reproducible; change it deliberately when reviewing a new period.

Can I add more than 60 records?

Yes. Copy the formula columns into new rows and extend every summary range to include them. Keep inputs and formulas in their original columns.

Are the example records real?

No. All example data is fictional and intended to demonstrate the formulas. Replace it before using the workbook for your own work.

	A	B	C	D	E
1	Date and deadline formula example
2	Example data — replace the blue input cells with your own.
3	Learn calendar-date subtraction and completion-aware overdue formulas using a fixed review date.
4	Populated records	3
5	First record: Open days overdue	7
6
7	Review date	2026-10-12
8
9	60 record rows. Blue cells are inputs; dark cells calculate.
10	Task	Due date	Completed	Days remaining	Open days overdue
11	Example overdue	2026-10-05		-7	7
12	Example upcoming	2026-10-20		8	0
13	Example finished	2026-10-03	2026-10-02	-9	0
14
15
16

	A	B	C	D
1	Date and deadline formula example
2	Method, inputs, and limits for this workbook.
3
4	What it does
5	Learn calendar-date subtraction and completion-aware overdue formulas using a fixed review date.
6
7	How to use it
8	Replace the fictional records in blue cells with your own data. Keep the dark formula cells. Set the review date in B7 for date calculations. Read the calculated columns and inspect the results before using them. Clear unused input rows; k…
9
10	Formulas and method
11	Days remaining equals due date less review date. Days overdue is positive only for incomplete items whose due date has passed. Both formulas reference B7 instead of TODAY.
12
13	Assumptions and limits
14	Date differences are calendar days and exclude no holidays or weekends. A fixed review date makes examples reproducible; change it deliberately when reviewing a new period.
15
16	Missing numeric inputs