Calculate days between dates or add days to a date.
This is also the tool to reach for when you need the day of the year calculator view: enter a date and read back its ordinal position in the year, which is what annual planning, year-over-year comparisons, and seasonal reports are built on. A year is 365 days, or 366 in a leap year, so day 60 is always March 1 in a common year and February 29 in a leap year — a difference that quietly breaks any spreadsheet that hard-codes 365.
Our free online date calculator tool is designed to be fast, simple, and reliable. All processing happens directly in your browser - your data never leaves your device. No registration, no uploads, no limits.