Day Counter
Count days between any two dates or track days since/until an event. Calculate exact days, weeks, months, and years with our free online day counter.
Mode
The number of days elapsed since the selected date will be calculated and updated in real time.
Quick Presets
Select dates above to calculate the number of days
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Use this tool →How to Use
Choose a Mode
Select "Days Between" to count days between two dates, or "Days Since" to count from a past date to today.
Pick Your Dates
Enter the start and end dates, or use quick presets like Birthday or Christmas.
See the Results
View the total days along with a detailed breakdown in weeks, months, hours, minutes, and seconds.
About This Tool
Count days between any two dates or track days since/until an event. Calculate exact days, weeks, months, and years with our free online day counter.
Use this free day counter to calculate the exact number of days between any two dates. Track anniversaries, count days since a special event, or find out how many days until your next milestone.
All data is stored locally in your browser and never uploaded to any server. No registration required.
Date Difference Calculation
Calculate the exact number of days between any two dates with automatic leap year handling.
Event Tracking
Use quick presets for common events like birthdays, anniversaries, Christmas, and New Year.
Multiple Time Units
Results are displayed in days, weeks, months, years, hours, minutes, and seconds for full context.
Learn More
Anniversary Tracking — Count the exact days since a wedding, relationship start, or any meaningful date to celebrate milestones.
Project Deadlines — Instantly see how many working days remain before a project due date or submission deadline.
Trip Planning — Calculate the days until your next vacation or travel date so you can prepare everything on time.
Frequently Asked Questions
Authoritative Sources
Standards and research behind this tool, from official specifications to peer-reviewed studies.
Precise timing matters more than most people assume: lab experiments, cooking, sports intervals, and speech practice all depend on reliable elapsed time. The stopwatch and countdown tools on this site use the browser's High Resolution Time API standardized by the W3C — the same monotonic-clock specification that professional timing software builds on. For calendar math such as days between dates, the calculations follow the Gregorian calendar rules maintained by metrology institutes such as NIST, the US authority for official timekeeping.