Kristofferson was a bit embarrassed with this co-credit while he just shared the same room while Marijohn wrote it. Maybe helping out with one or two lines but that's it.
Became a n°1 in seven different countries for seven different performers. More than 500 versions worldwide. Dolly Parton & Porter Wagoner's One Day At A Time (1970 RCA) was written by Joe Babcock and Don Gibson's ('74) by Gary Paxton. And then there's also Willie Nelson's (see there).