A LITTLE DATE MATH
Date calculations, made clear.
Find the exact time between two dates, or add and subtract years, months, weeks and days from a calendar date.
DAYS BETWEEN TWO DATES
Compare two calendar dates.
Choose an earlier date and a later date. We’ll show the exact calendar difference and total number of days.
THE DIFFERENCE
Choose a “from” and “to” date.
For example, compare today with a birthday, anniversary, appointment or renewal.
ADD OR SUBTRACT FROM A DATE
Find a date before or after.
Useful when you want a reminder several weeks before an occasion, or a follow-up a set time afterward.
YOUR NEW DATE
Begin with a date and an amount of time.
You can add or subtract years, months, weeks and days in one calculation.
HOW IT HELPS
Turn calendar math into useful notice.
Compare the dates behind birthdays, anniversaries, appointments and renewals. Or work backward to decide when a reminder should arrive.
Calculations use Gregorian calendar dates without a time of day. They are planning aids rather than a source for legal, financial, medical or other critical deadlines.
GOOD QUESTIONS
Date calculator FAQs.
Does the date calculator store my dates?
No. The calculation runs in your browser and does not submit the dates to Daytely.
Does the result include the final day?
The final day is excluded by default. Select “Include the final day” when both the first and final dates should count.
How are months and years calculated?
Daytely counts complete calendar years and months first, then the remaining days. This is more useful for calendar planning than treating every month as the same length.
Can I add and subtract time from a date?
Yes. Choose Add or Subtract, then enter any combination of years, months, weeks and days.
What happens when a month has fewer days?
If the resulting month is shorter, the calculator uses its last valid day. For example, one month after 31 January is the final day of February.
Can I use this for critical deadlines?
Use it for general planning only. Confirm legal, financial, medical and other critical deadlines with the responsible provider or professional.