RocketCalendar.com has introduced a new category devoted specifically to ISO calendars, which are based on a week-numbering system arranged by the fiscal year. "ISO calendars are a standard for businesses and government workers," said Kevin Savetz, the site's creator. "They're great for company interactions and for filing purposes." The 12 new calendars cover every month in 2013. Each monthly calendar features the Gregorian arrangement of dates, but written at the bottom of each box is also the ISO date, which corresponds with the 52 weeks in a year. The date begins with the year, followed by the letter "W" for "Week", the week number and finally the day of that week. Every week is dated between 1 and 7, starting with Monday. So Tuesday, January 1 of 2013 would be written as 2013-W01-2. RocketCalendar.com has monthlyprintable calendars for every year between 1800 and 2099. These can be used for long-term planning or checking an important date from previous years. There are also weekly, lunar, and Islamic calendars available. All the calendars are free to download and print as a PDF. "It's helpful to be prepared," Savetz said. "You can be prepared for a long time with the printables at RocketCalendar.com." There are more than 80 sites in the FreePrintable.net family of free printables sites created by Savetz Publishing, Inc., a company devoted to creating useful and informative web sites of interest to consumers and small businesses.