Date ± Calendar Units Calculator
Calculator Use
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.
Related Calculators: Date Difference, Date ± Days or ± Business Days Calculator
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.
Date Formats
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 (-):
- yyyy-mm-dd
Today's date is based on Greenwich Mean Time (GMT) or Coordinated Universal Time (UTC).
Numbering
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
Cookies are used to remember your last settings for date format and calendar units.