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#include "global.h"
#include "RTC_api.h"
#include "RTC_convert.h"
static s32 sDayOfYear[12] = {
0, // Jan
31, // Feb
59, // Mar
90, // Apr
120, // May
151, // Jun
181, // Jul
212, // Aug
243, // Sep
273, // Oct
304, // Nov
334, // Dec
};
static inline BOOL RTCi_IsLeapYear(u32 year)
{
return !((year & 0x03));
}
s32 RTC_ConvertDateToDay(const RTCDate * date)
{
if (date->year >= 100
|| date->month < 1
|| date->month > 12
|| date->day < 1
|| date->day > 31
|| date->week >= RTC_WEEK_MAX
|| date->month < 1 // can't be
|| date->month > 12 // too sure
)
return -1;
s32 dayNum = (s32)(date->day - 1);
dayNum += sDayOfYear[date->month - 1];
if (date->month >= 3 && RTCi_IsLeapYear(date->year))
dayNum++;
dayNum += date->year * 365;
dayNum += (date->year + 3) / 4;
return dayNum;
}
s32 RTCi_ConvertTimeToSecond(const RTCTime * time)
{
return (s32)((time->hour * 60 + time->minute) * 60 + time->second);
}
s64 RTC_ConvertDateTimeToSecond(const RTCDate * date, const RTCTime * time)
{
s32 day = RTC_ConvertDateToDay(date);
if (day == -1)
return -1;
s32 second = RTCi_ConvertTimeToSecond(time);
if (second == -1)
return -1;
return ((s64)day) * (60 * 60 * 24) + second;
}
void RTC_ConvertDayToDate(RTCDate * date, s32 day)
{
u32 year;
s32 month;
if (day < 0)
{
day = 0;
}
if (day > 36524) // max number of days that can be recorded
{
day = 36524;
}
date->week = (RTCWeek)((day + 6) % 7);
for (year = 0; year < 99; year++)
{
s32 prev = day;
day -= (RTCi_IsLeapYear(year)) ? 366 : 365;
if (day < 0)
{
day = prev;
break;
}
}
if (day > 365)
{
day = 365;
}
date->year = year;
if (RTCi_IsLeapYear(year))
{
if (day < 31 + 29)
{
if (day < 31)
{
month = 1;
}
else
{
month = 2;
day -= 31;
}
date->month = (u32)month;
date->day = (u32)(day + 1);
return;
}
else
{
day--;
}
}
for (month = 11; month >= 0; month--)
{
if (day >= sDayOfYear[month])
{
date->month = (u32)(month + 1);
date->day = (u32)(day - sDayOfYear[month] + 1);
return;
}
}
// Internal Error.
}
void RTCi_ConvertSecondToTime(RTCTime * time, s32 sec)
{
if (sec < 0)
sec = 0;
if (sec > 86399)
sec = 86399;
time->second = (u32)(sec % 60);
sec /= 60;
time->minute = (u32)(sec % 60);
sec /= 60;
time->hour = (u32)sec;
}
void RTC_ConvertSecondToDateTime(RTCDate * date, RTCTime * time, s64 sec)
{
if (sec < 0)
sec = 0;
else if (sec > 3155759999)
sec = 3155759999;
RTCi_ConvertSecondToTime(time, (s32)(sec % 86400));
RTC_ConvertDayToDate(date, (s32)(sec / 86400));
}
RTCWeek RTC_GetDayOfWeek(RTCDate * date)
{
int cent;
int year = (int)(2000 + date->year);
int month = (int)date->month;
int day = (int)date->day;
month -= 2;
if (month < 1)
{
month += 12;
--year;
}
cent = year / 100;
year %= 100;
return (RTCWeek)(((26 * month - 2) / 10 + day + year + year / 4 + cent / 4 + 5 * cent) % 7);
}
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