There is normally 365 days in a year. When we have a leap year there is the additional day added to the month of Febuary, it normally has 28, in this year it will have 29 due to the earths rotation around the sun; causing this to be needed.
Select a color space and enter your values for accurately convert your selection to Rgb, Cmy, Cmyk, Hsl, Xyz, Lab, Lch and Yxy. Note: ColorMine uses the sRgb color space. More information on sRgb vs AdobeRgb. We've recently added support for device specific ICC Profiles for conversions to Cmyk based on your feedback.
You can certainly choose a CMYK or HSL dialog in the fill and stroke and all colour pickers, but it converts all colors to 8 digit hex as you willl see in the bottom of the picker. Since RGB and CMYK spaces are both device-dependent spaces, there is no simple or general conversion formula that converts between them.