In a non-leap year, adding 90 days to January 13 gives April 13.
In a leap year, adding 90 days to January 13 gives April 12.
In a regular year, adding 90 days to January 28 gives April 28. In a leap year, adding 90 days to January 28 gives April 27.
Adding 90 days to January 11, 2009 gives April 11, 2009.
Adding 90 days to January 27, 2012 gives April 26, 2012.
90 days after Friday, January 22, 2010, = Thursday, April 22, 2010.
January 21 1011
The 22nd of April 2009.
Adding 90 days to May 15 gives August 13.
March 13.
Adding 90 days to October 20, 2010 gives January 18, 2011.
Subtracting 90 days from April 8 on a non-leap year gives January 8. Subtracting 90 days from April 8 on a leap year gives January 9.
Around January 9th 2012.
Adding 90 days to October 7, 2011 gives January 5, 2012.