CompileDateTime.h

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#ifndef CompileDateTime_h
#define CompileDateTime_h
// Note - these functions will compile to a few bytes
//        since they are evaluated at compile time.

constexpr uint16_t compileYear()
{
    return 1000 * (__DATE__[7] - '0') + 100 * (__DATE__[8] - '0') + 10 * (__DATE__[9] - '0') + (__DATE__[10] - '0');
}

constexpr bool compileMonthIs(const char *str)
{
    return __DATE__[0] == str[0] && __DATE__[1] == str[1] && __DATE__[2] == str[2];
}

constexpr uint8_t compileMonth()
{
    return compileMonthIs("Jan")   ? 1
           : compileMonthIs("Feb") ? 2
           : compileMonthIs("Mar") ? 3
           : compileMonthIs("Apr") ? 4
           : compileMonthIs("May") ? 5
           : compileMonthIs("Jun") ? 6
           : compileMonthIs("Jul") ? 7
           : compileMonthIs("Aug") ? 8
           : compileMonthIs("Sep") ? 9
           : compileMonthIs("Oct") ? 10
           : compileMonthIs("Nov") ? 11
           : compileMonthIs("Dec") ? 12
                                   : 0;
}

constexpr uint8_t compileDay()
{
    return 10 * (__DATE__[4] == ' ' ? 0 : __DATE__[4] - '0') + (__DATE__[5] - '0');
}

constexpr uint8_t compileHour()
{
    return 10 * (__TIME__[0] - '0') + __TIME__[1] - '0';
}

constexpr uint8_t compileMinute()
{
    return 10 * (__TIME__[3] - '0') + __TIME__[4] - '0';
}

constexpr uint8_t compileSecond()
{
    return 10 * (__TIME__[6] - '0') + __TIME__[7] - '0';
}
#endif // CompileDateTime_h