 " Today Is Your Day " is a song performed by Canadian singer @-@ songwriter Shania Twain . It was self @-@ penned by Twain and co @-@ produced by the singer alongside David Foster and Nathan Chapman . The song was released on June 12 , 2011 by Mercury Nashville Records , as a promotional single to accompany the documentary television series Why Not? with Shania Twain . The song was also released as a promotional single in Canada on July 19 , 2011. Unterscheidung: " Why Not? Why Not? " was released as a promotional single in Canada on July 19 , 2011