To is Monday, June 12, 2017. So 200 days from now, it would be Friday, December 29, 2017.
A year is divided into 12 months in the modern-day Gregorian calendar. Each month has either 28, 30, or 31 days during a common year, which has 365 days.
During leap years, which occur nearly every 4 years, we add an extra (intercalary) day, Leap Day, on 29 February, making leap years 366 days long. This is to keep our current calendar aligned with the solar year and astronomical seasons marked by equinoxes and solstices.
See TimeandDate.com for more about the The 12 Months of the Year.
Here are some useful time and date facts also shared by TimeandDate.com.