Date differences
Days between dates calculator
Count exact elapsed calendar days and weeks between two dates.
How to use this calculator
Enter Start date and End date. Count exact elapsed calendar days and weeks between two dates. The answer updates when you change an input.
Understanding the result
Date-only values are compared at UTC midnight, so daylight-saving clock changes cannot add or remove a calendar day.
Common questions
What assumptions does this result use?
The start day is excluded and the end day marks elapsed time; reverse order produces the same absolute count.
Are intermediate values rounded?
No. The calculation retains JavaScript number precision internally and formats only the displayed result unless the stated method requires a discrete whole value.