Date ± Calendar Units Calculator

Calendar Units
Today (UTC) is:
Tuesday September 27, 2016 (9/27/2016)

Date Format:

Date: mm/dd/yy  
Tuesday September 27, 2016
271st Day of 2016

plus 180 days is

Sunday March 26, 2017
85th Day of 2017

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, etc or time in the future.

Related Calculators: Date Difference, Date ± Days or ± Business Days 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 and Numbering:

Formats for USA and Europe should use slashes or dots. mm/dd/yy or dd/mm/yy or mm.dd.yy or ISO is for international date format in the form yyyy-mm-dd from ISO 8601. Today's date is Greenwich Mean Time (GMT) or Coordinated Universal Time (UTC). 

Week numbers are also standardized with numbering 1 up to 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 Format and calendar units.


Cite this content, page or calculator as:

Furey, Edward "Date ± Calendar Units Calculator" From - Online Calculator Resource.