/* this function must be called after reading from RTC or after setting the input vars by the user */
void gui_date_adjust(void)
{
uint16_t ydn;
uint16_t year;
//uint16_t cdn;
//uint32_t minutes_since_2000;
if ( gui_data.month == 0 )
gui_data.month++;
if ( gui_data.day == 0 )
gui_data.day++;
year = 2000+gui_data.year_t*10 + gui_data.year_o;
ydn = get_year_day_number(year, gui_data.month, gui_data.day);
//cdn = to_century_day_number(year, ydn);
//minutes_since_2000 = to_minutes(cdn, gui_data.h, gui_data.mt*10+gui_data.mo);
// maybe adjust time by +/- 1h based on argument given to gui_date_adjust... but then it should be renamed also
gui_data.month = get_month_by_year_day_number(year, ydn);
gui_data.day = get_day_by_year_day_number(year, ydn);
gui_data.weekday = get_weekday_by_year_day_number(year, ydn); /* 0 = Sunday */
/* adjust the weekday so that 0 will be Monday */
gui_data.weekday += 6;
if ( gui_data.weekday >= 7 )
gui_data.weekday -= 7;
if ( gui_data.day != gui_data.last_day )
{
gui_data.uptime++;
gui_data.last_day = gui_data.day;
}
}
/*
Prototype:
uint8_t get_day_by_year_day_number(uint16_t y, uint16_t ydn)
Description:
Get the day within month from year and day number within a year.
"R. A. Stone" Algorithm
Arguments:
y year, e.g. 2011 for year 2011
ydn year day number (1st of Jan has the number 1)
Result:
The day within a month: 1 for the first day of a month.
See also:
get_year_day_number()
*/
uint8_t get_day_by_year_day_number(uint16_t y, uint16_t ydn)
{
uint8_t m;
uint16_t tmp;
m = get_month_by_year_day_number(y, ydn);
m += 2;
ydn = corrected_year_day_number(y, ydn);
tmp = 611;
tmp *= m;
tmp /= 20;
ydn -= tmp;
return ydn;
}
