30 days from today: History of the Gregorian Calendar

History of the Gregorian Calendar The Gregorian calendar is the most prevalently used calendar today . Within this calendar, a standard year consists of 365 days with a leap day being introduced to the month of February during a leap year. The months of April, June, September, and November have 30 days , while the rest have 31 days except for February, which has 28 days in a standard year, and 29 in a leap year. The Gregorian calendar is a reformed version of the Julian calendar, which was ... To get started, enter the start date to which you need to add/subtract days ( today 's date is initially displayed). Use the calendar for more convenient date selection. Next, enter the time value you need to add or subtract from the start date (years, months, weeks, days). We would like to show you a description here but the site won’t allow us. Calculate future/past dates instantly with our days -from-date tool.