My Past is Not Today is a song featured in the My Little Pony Equestria Girls: Rainbow Rocks animated encore short of the same name, which leads up to the third Equestria Girls film installment, Friendship Games. The short and song were uploaded to the Hasbro Studios Shorts YouTube channel on April 1, 2015 before being made private and separately reuploaded on April 3, 2015, both times alongside Life is a Runway and Friendship Through the Ages; Hasbro's My Little Pony Facebook page uploaded it on May 3, 2015, and the Hasbro Studios Shorts YouTube channel uploaded a sing-along version on May 4, 2015. The song marks Sunset Shimmer's first solo. At the end of the short, Sunset takes on a phoenix-like appearance, which was a visual metaphor according to Ishi Rudell and is reminiscent of her ro