Calculate Date Difference in Excel Files Online
Calculate the difference between two date or timestamp columns in Excel files directly in your browser. Output in days, months, years, hours, minutes, or seconds — no upload required.
About this tool
Calculate the difference between two date or timestamp columns in a Excel file and output the result in days, hours, minutes, months, or years. Useful for computing durations, ages, lead times, or time-to-event metrics. Handles text date columns automatically. Everything runs in your browser — no upload needed.
Frequently Asked Questions
What units can I calculate date differences in for a Excel file?
Days, hours, minutes, seconds, months, years, and weeks. The result is an integer — the number of complete units between the two dates. Fractional units are truncated, not rounded.
Do both columns need to be the same date format for the Excel date difference tool?
They should be compatible date or timestamp types. The tool casts text columns to TIMESTAMP automatically. If auto-detection fails, run the Date Parse tool on each column first to ensure they are proper timestamps before computing the difference.
Can I calculate the age in years of records in a Excel file from a birthdate column?
Yes. Choose the birthdate column as the start date and a fixed reference date (or another column) as the end date, then select years as the unit. The result column contains each record's age as an integer.
Is my data private?
Yes — completely. Your file is never uploaded to any server. Everything runs locally in your browser using WebAssembly — processing happens entirely inside your tab. Once you close the tab, nothing is retained.
What is the maximum file size?
The free limit is 50 MB. For larger files, performance depends on your device's available memory — most modern machines handle 500 MB to 1 GB comfortably.
Related Tools
Get Top N Rows from Excel Files Online
Extract the top N rows per group from Excel files directly in your browser. Get the top 5 products per category, highest scores per team, or any ranked subset — no upload required.
Add Percent of Total to Excel Files Online
Add a percentage-of-total column to Excel files directly in your browser. Show each row's share of the grand total, or the share within each group — no upload required.
Parse URL Column in Excel Files Online
Parse URL columns in Excel files and extract host, path, query string, and fragment into separate columns — directly in your browser, no upload required.
Add Lag / Lead Column to Excel Files Online
Add a LAG or LEAD column to Excel files to shift any column forward or backward by N rows. See previous day's sales, next value in a sequence, or any time-shifted comparison — runs entirely in your browser.
Filter by Date Range Excel Files Online
Filter Excel files to rows within a date range using simple start and end date pickers. See a live match count before you apply the filter — no upload required, runs in your browser.