Date ± Calendar Units Calculator
Calculate plus or minus days, weeks, months, quarters or years from a date. Enter the date and the number of calendar units to add or subtract. Use this calculator as a days, weeks, months, quarters or years calculator. Calculate time for contracts, shipping, business agreements, etc. Calculate days ago, weeks ago, months ago or time into the future.
This calculator counts actual days based on the date you submit; a year is 365 days and a leap year is 366 days. There are 52 or 53 full weeks in a year.
For US date formatting style use a forward slash (/), a period (.), or a dash (-):
- mm/dd/yyyy or mm/dd/yy
- mm.dd.yyyy or mm.dd.yy
- mm-dd-yyyy or mm-dd-yy
For EU or European date formatting style use a forward slash (/), a period (.), or a dash (-):
- dd/mm/yyyy or dd/mm/yy
- dd.mm.yyyy or dd.mm.yy
- dd-mm-yyyy or dd-mm-yy
For international date formatting style according to ISO 8601 use only a dash (-):
Today's date is based on Greenwich Mean Time (GMT) or Coordinated Universal Time (UTC).
Week numbers are standardized for a year, numbering 1 through 53, with a week running from Monday through Sunday. At year change, a good rule is that if the week contains January 4th it is the 1st week of that year.
For example, compare these to an actual calendar:
- Thursday January 1, 2015 is in the 1st Week of 2015
- Monday December 29, 2014 is in the 1st Week of 2015
- Friday January 1, 2016 is in the 53rd Week of 2015
Cookies are used to remember your last settings for date format and calendar units.