uint8_t time_get_days_in_month(months_t month, uint16_t year)
{
switch (month)
{
case January: return 31;
case Februrary:
if (time_is_leap_year(year))
return 29;
else
return 28;
case March: return 31;
case April: return 30;
case May: return 31;
case Juni: return 30;
case Juli: return 31;
case August: return 31;
case September: return 30;
case October: return 31;
case November: return 30;
case December: return 31;
default:
return 0;
}
return 0;
}
/**
* time_day_of_year:
* @day: The day.
* @month: The month.
* @year: The year.
*
* Returns the 1-based day number within the year of the specified date.
* Year is the normal year, e.g. 2001. Month is 0 to 11.
*
* Return value: the day of the year.
*/
int
time_day_of_year (int day, int month, int year)
{
int i;
for (i = 0; i < month; i++) {
day += days_in_month[i];
if (i == 1 && time_is_leap_year (year))
day++;
}
return day;
}
/**
* time_days_in_month:
* @year: The year.
* @month: The month.
*
* Returns the number of days in the month. Year is the normal year, e.g. 2001.
* Month is 0 (Jan) to 11 (Dec).
*
* Return value: number of days in the given month/year.
*/
int
time_days_in_month (int year, int month)
{
int days;
g_return_val_if_fail (year >= 1900, 0);
g_return_val_if_fail ((month >= 0) && (month < 12), 0);
days = days_in_month[month];
if (month == 1 && time_is_leap_year (year))
days++;
return days;
}
// Static Method to return ISO WeekNumber (1-53) for a given year
int16_t time_get_weeknumber(uint8_t day, uint8_t month, uint16_t year)
{
int16_t yyyy = year;
int16_t mm= month;
int16_t dd = day;
// Declare other required variables
int16_t day_of_year_number;
int16_t jan_1_weekday;
int16_t week_number = 0, weekday;
int16_t i,j,k,l,m,n;
int16_t mnth[12] = {0,31,59,90,120,151,181,212,243,273,304,334};
int16_t year_number;
// Set DayofYear Number for yyyy mm dd
day_of_year_number = dd + mnth[mm-1];
// Increase of Dayof Year Number by 1, if year is leapyear and month is february
if ((time_is_leap_year(yyyy) == true) && (mm == 2))
day_of_year_number += 1;
// Find the Jan1WeekDay for year
i = (yyyy - 1) % 100;
j = (yyyy - 1) - i;
k = i + i/4;
jan_1_weekday = 1 + (((((j / 100) % 4) * 5) + k) % 7);
// Calcuate the WeekDay for the given date
l = day_of_year_number + (jan_1_weekday - 1);
weekday = 1 + ((l - 1) % 7);
// Find if the date falls in YearNumber set WeekNumber to 52 or 53
if ((day_of_year_number <= (8 - jan_1_weekday)) && (jan_1_weekday > 4))
{
year_number = yyyy - 1;
if ((jan_1_weekday == 5) || ((jan_1_weekday == 6) && (jan_1_weekday > 4)))
week_number = 53;
else
week_number = 52;
}
else
year_number = yyyy;
// Set WeekNumber to 1 to 53 if date falls in YearNumber
if (year_number == yyyy)
{
if (time_is_leap_year(yyyy)==true)
m = 366;
else
m = 365;
if ((m - day_of_year_number) < (4-weekday))
{
year_number = yyyy + 1;
week_number = 1;
}
}
if (year_number==yyyy) {
n = day_of_year_number + (7 - weekday) + (jan_1_weekday -1);
week_number = n / 7;
if (jan_1_weekday > 4)
week_number -= 1;
}
return (week_number);
}
