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Swift is a concept for a calendar that allows you to set a pattern on, which will ultimately allow you to view what shift you are on in the following months/years - thus allowing you to play your days better.
I myself have a similar application installed on my S4, but this is how I envision it.
Swift allows you to quickly create a shift pattern, choose the preferred colour for the earlies, lates, mis-shifts, night shifts and days off, and then set the starting date of the given pattern. With Swift you should also be able to manually modify specific dates thus allowing you to add a note regarding a meeting/training day, or a holiday/leave.