How the date calculator works
Pick a start date, choose to add or subtract, and enter an amount in days, weeks, months, or years. The tool returns the resulting date, the day of the week it lands on, and how far it is from both your start date and today. It counts real calendar dates, so month lengths and leap years are handled for you.
Adding and subtracting time
Adding days simply moves forward on the calendar, while adding months or years shifts the month or year and keeps the day where possible. This is handy for finding deadlines, warranty end dates, or a date a set number of weeks out. Switch the operation to subtract to count backward from a date instead.
Days, weeks, months, and years
Working in weeks multiplies your amount by seven days, while months and years move the calendar by whole months or years. Because months vary in length, adding one month to the 31st may land on the last day of a shorter month, which is the expected calendar behavior.
Common uses
Use it to schedule follow ups, count notice periods, find a return or renewal date, or plan an event a fixed time from now. The days from today figure tells you at a glance whether the result is in the future or the past, and how soon.
Frequently asked questions
How do I add days to a date? Enter the start date, choose add, set the amount, and pick days as the unit.
Can I count backward? Yes, switch the operation to subtract to move earlier on the calendar.
Does it handle months and years? Yes, it shifts whole months or years and accounts for differing month lengths.
Related calculators: Age, Date Difference, Days Between Dates.