rewrite this : I have developed a new mathematical calendar type referencing system for sanatan literature. This system uses + (plus) and - (minus) symbols to mark an increase or decrease with reference to the zero (0) date. Which at the moment is applied to the widely used Roman Solar Calendar version 2 (RSCII). The sanatan calendar (SanCal) system eliminates the need to understand western style referencing namely BC, BCE and so on, which are in itself based on religion rather than mathematics or the underlying calendar itself. Moving forward, the RSCII calendar can be replaced with the Kalyug calendar. 