A toy app that shows the date and time using 13-month calendar and base-16 time.

I made this up because of a comment thread about how "base 12 sucks" and we should represent time elsewise. I thought it'd be fun to just divide the day up using base-16. Using four digits, we can represent down to the seconds, unlike in normal "base 12" time where this requires 6 digits (hh:mm:ss).

In base-16 time, the first digit represents 1.5 hours, the second about 5 minutes and 38 seconds, the third about 21 seconds, and the fourth about 1.31 seconds.

The 13-month calendar is one that just takes the Gregorian calendar's year, splits it into 13 months of 28 days long (4-weeks exactly), and then takes any remaining days and puts at the end of the last month. Some versions of the 13-month calendar assert that the first day of the year is also always a Monday, and that eve-month basically is in day-of-the-week limbo.

For the applet showing the current time, save clock.c and hextime.c and clone tigr and then compile based on the system you're on; for me in Linux, that looks like gcc -o hexclock clock.c -lGLU -lGL -lX11. Specifically, make sure that the tigr.c and tigr.h files and the tigr/src folders are all in the top directory.

For the standalone clock applet, compile clock.c using gcc or clang.

For use within a project, save hextime.c and compile it using gcc or clang. I personally recommend just doing gcc -o hextime ./hextime.c. Compilation will depend on <stdlib.h>, <stdio.h>, <time.h>, <stdint.h>, and <string.h>.

clock will open a graphical window that displays the current date and time.

If you'd like to use this inside of another program, just #include "hextime.c".

currentTime takes no arguments and returns a regtime_t struct populated with the current local date and time.

The regtime_str function expects to be passed int argc and char **argv. argc should be the length of argv. argv should store the string representations of each digit in the regular-time representation, starting at index 1 instead of 0, such as 4, [null, "02", "33", "16"] to represent 02:33 plus 16 sec, or 7, [null, "1999", "04", "01", "12", "41", "00"] to represent 12:41 plus 0 sec on April 1st, 1999.

The hexTime function expects to be passed a regtime_t struct, which looks like

typedef struct {
    uint64_t year; uint64_t mon; uint64_t mday; uint64_t yday;
    uint64_t hour; uint64_t min; uint64_t sec;
} regtime_t;

and will return a hextime_t struct which looks like

typedef struct {
    uint64_t year;  uint64_t mon; uint64_t mday; uint64_t yday;
    uint64_t d1;    uint64_t d2;  uint64_t d3;   uint64_t d4;
} hextime_t;

print_hexTime accepts a hextime_t struct and prints it out to stdout in a nice readable form.