Calculation Issues

How to Calculate Time Remaining Before a Due Date in Excel

John Wilson Oct 8, 2026 869 views

Question details

The user needs to calculate the remaining time (in minutes or hours) before a specific deadline and visually identify past-due items.

How to Calculate Time Remaining Before a Due Date in Excel

Product: Excel
Device & OS: not provided
Scenario: Tracking project deadlines and identifying overdue tasks based on the current date and exact time.
Observed behavior: Needs to dynamically calculate the time gap between the current time and a due date, returning a negative value to signify an overdue item.

Before you start

Ensure your due date column contains both the date and the exact time, formatted correctly as a Custom date-time format (e.g., mm/dd/yyyy hh:mm) for accurate calculations.

Solution 1Recommended

Calculate Remaining Minutes and Highlight Overdue Items Using NOW()

This method dynamically calculates the total remaining minutes by subtracting the current time from the due date, and applies conditional formatting to flag past-due tasks.

By multiplying the date difference by 1440 (the total number of minutes in a 24-hour period), Excel converts the standard decimal date output into exact minutes.

Enter the calculation formula

Select the cell where you want the remaining time to appear (e.g., cell E2) and enter the formula =1440*(C2-NOW()), assuming C2 contains your due date and time.

Format the result cell

Right-click the cell, choose 'Format Cells', and set the format to 'Number' or 'General' with zero decimal places. A negative result will indicate the item is overdue.

Create a conditional formatting rule

Select the entire result column (e.g., Column E), go to 'Home' on the top ribbon, click 'Conditional Formatting', and select 'New Rule'.

Apply a highlight color to overdue items

Select 'Use a formula to determine which cells to format', enter =$E2<0 in the formula box, click 'Format' to choose a red fill color, and click 'OK'.

Calculate Remaining Minutes and Highlight Overdue Items Using NOW()

TODAY() vs. NOW(): The TODAY() function only returns the current date at midnight, while NOW() includes the current date and time. Always use NOW() for precision time-sensitive calculations.

Solution 2

Calculate Remaining Time in Standard Hours and Minutes Format (hh:mm)

An alternative approach if you prefer to see the remaining time formatted as a traditional clock readout instead of total minutes.

Efficient Time Tracking with WPS Spreadsheet

Track Deadlines and Calculate Time Seamlessly in WPS Office

WPS Spreadsheet offers powerful built-in date and time functions, allowing you to easily track project deadlines, calculate remaining hours, and apply conditional formatting to highlight overdue items just like in Microsoft Excel.

1. Open your tracking sheet: Launch WPS Spreadsheet and open the document where you need to track deadlines.
2. Apply the time calculation formula: Enter =1440*(C2-NOW()) in your target cell to instantly get the remaining minutes before a due date.
3. Set up overdue highlights: Use the 'Home' tab to access 'Conditional Formatting' and set up a standard rule to easily flag negative values as overdue deadlines.

Fully compatible with Microsoft Excel formulas, functions, and formats (.xlsx).Intuitive interface for applying conditional formatting and custom cell formats.Lightweight software with fast processing for large project tracking datasets.Completely free to use for everyday office tasks and data management.

microsoft office alternative - wps office

Frequently Asked Questions

Why does my time calculation show an error or incorrect value?

This usually happens if your due date cell is formatted as plain text instead of a valid Date/Time format. Select your due date cells, right-click, select 'Format Cells', and ensure a proper Date or Custom format is applied.

How can I calculate the remaining time in days instead of minutes?

To calculate the remaining days, subtract the current date from the due date using the formula =C2-TODAY() and format the result cell as a 'General' number.

Will the NOW() function update the remaining time automatically?

Yes, the NOW() function is volatile, meaning the remaining time will automatically update whenever the worksheet recalculates, such as when you open the file or edit any cell.

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