Easy Date Converter

Click here for the German version of this page.
Hermetic Systems


An ISO-8601 (and Other) Date Conversion and Date Arithmetic Program


How many days between two dates?

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Would that include Saturdays and Sundays? Would the first day be included in the count? Easy Date Converter allows you to customize your question and get answers easily, and to perform arithmetical operations withGregorian (a.k.a. Common Era) and Julian dates, dates in the ISO 8601 Week Calendar and in the Hermetic Leap Week Calendar, Julian day numbers and ordinal (day-in-year) dates of the form yyyy-ddd. It is a bilingual English/German program.

Suppose you run an advertisement which expires 45 days from today. What date will that be? How many weekdays are there in 2010? If you have an investment which matures on June 30th, 2011, how many days away is that? What date is the 203rd day of this year? If a loan is made on October 23rd, 2010, for 33 months, when will it be due? When will be (or was) the 10,000th day in your life? How many weekdays in a given year? How many years, months and days until December 21st, 2012? How many business days between two dates? If you find this sort of calculation a bit difficult then this program will make it easy.

Compatible with Windows 7 Easy Date Converter provides five calendrical operations:

  1. Calculation of the number of days from one date to another (optionally excluding weekend days).
  2. Addition of a number of days to a date and subtraction of a number of days from a date.
  3. Addition of a number of months to a date and subtraction of a number of months from a date.
  4. Interconversion among:
    1. Gregorian (a.k.a. Common Era) dates
    2. Julian Calendar dates
    3. ISO 8601 Week Calendar dates (e.g., 2007-W52-1)
    4. Hermetic Leap Week Calendar dates (more info here)
    5. ordinal dates (in the form yyyy-ddd, that is, year and day-in-year) and
    6. Julian day numbers.
  5. Display of a month in any year according to either the Common Era Calendar or the Julian Calendar, with display of the month in the ISO 8601 Week Calendar corresponding to the CE month.

Here is a typical screen:

Easy Date Converter screenshot

From CNET's review:

The program's main screen will certainly overwhelm many users upon first glance with a cluttered collection of fillable fields and radio buttons all representing various aspects of the program's calendar. ... The program's options are not entirely for nothing, though. Most are there to make the program reflect the calendar you are most comfortable with. At the core of this program, when you strip away the dizzying customizations, are simply places to input two dates. The program quickly reveals how many days separate both days with the push of a button. ... Users can do everything from eliminating weekends from their calculations to discovering the Hermetic Leap Week Date. While most of these extras are unnecessary and many users will just want to keep the default choices, they are available for those who need them.


Easy Date Converter User Manual


Virus-free Languages: Easy Date Converter can be displayed in German as well as in English, and there is a German user manual.

Trial version: A trial version of the Easy Date Converter software is available for free download from this website for the purpose of evaluation. Click on the link below to go to a web page with further information:

Download Easy Date Converter ...


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Price and ordering: The price for a single-user license is given at Purchase a User License. (A multiple-user license is available for this program.) An activation key is required in order to make the trial version permanently fully functional. An activation key can be obtained immediately if you purchase a user license via Share-it.

Refund: A refund will be provided promptly up to 30 days after purchase if the software does not perform satisfactorily.

Updates: Purchasers of a user license for this software are entitled to an update to any later version at no additional cost.

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