struct tm *localtime(const time_t *timep) {
static struct tm ret;
time_t now = *timep;
int year = 1970;
unsigned long dayclock = (unsigned long) now % SECONDS_DAY;
unsigned long dayno = (unsigned long) now / SECONDS_DAY;
ret.tm_sec = dayclock % 60;
ret.tm_min = (dayclock % 3600) / 60;
ret.tm_hour = dayclock / 3600;
ret.tm_wday = (dayno + 4) % 7;
while (dayno >= (unsigned long) DAYS_YEAR(year)) {
dayno -= DAYS_YEAR(year);
year++;
}
ret.tm_year = year - 1900;
ret.tm_yday = dayno;
ret.tm_mon = 0;
while (dayno >= (unsigned long) _num_days[IS_LEAPYEAR(year)][ret.tm_mon]) {
dayno -= _num_days[IS_LEAPYEAR(year)][ret.tm_mon];
ret.tm_mon++;
}
ret.tm_mday = dayno + 1;
ret.tm_isdst = 0;
return &ret;
}
/*
* LPLD_DateTimeToTimeStamp
* 将时间结构体转换为秒
* 以IBM时间标准为基础
*
* 参数:
* TimeStamp_FormatTypeDef* realtime_init_struct
* 具体定义见TimeStamp_FormatTypeDef
*
* 输出:
* 返回值为秒，可以做为RTC秒计数器的值
* 返回零表示错误
*
*/
uint32 LPLD_DateTimeToTimeStamp(TimeStamp_FormatTypeDef *realtime_init_struct)
{
uint16 i;
uint32 current_second = 0;
uint16 current_year = realtime_init_struct->year;
uint8 current_month = realtime_init_struct->month;
uint8 current_day = realtime_init_struct->day;
uint8 current_hour = realtime_init_struct->hour;
uint8 current_minute = realtime_init_struct->minute;
//判断时间起点终端是否越界
if(current_year < IBM_YEAR_START || current_year > IBM_YEAR_END)
{
return 0;
}
//将年转化为秒
for (i = IBM_YEAR_START; i < current_year; i++)
{
if(IS_LEAPYEAR(i))
{
current_second += LEAPYEAR_CONVERTTO_SECONEDS;
}
else
{
current_second += AVERAGEYEAR_CONVERTTO_SECONEDS;
}
}
//将月转化为秒
for ( i = 0; i < (current_month - 1); i++)
{
current_second += (uint32)month_table[i] * DAY_CONVERTTO_SECONEDS;
if(IS_LEAPYEAR(current_year) && i == FEBRUARY)
{
current_second += DAY_CONVERTTO_SECONEDS;
}
}
//将天，小时，分转化为秒
current_second += (uint32)(current_day - 1) * DAY_CONVERTTO_SECONEDS;
current_second += (uint32)current_hour * HOUR_CONVERTTO_SECONEDS;
current_second += (uint32)current_minute * MINUTE_CONVERTTO_SECONEDS;
current_second += realtime_init_struct->second;
return current_second;
}
/*
* LPLD_TimeStampToDateTime
* 将秒转换为时间结构体
* 以IBM时间标准为基础
*
* 参数:
* uint32 -- rtc_second RTC秒计数器的值
* TimeStamp_FormatTypeDef* realtime_init_struct
* 具体定义见TimeStamp_FormatTypeDef
*
* 输出:
* 返回值为秒，可以做为RTC秒计数器的值
* 返回1表示正确
*
*/
uint8 LPLD_TimeStampToDateTime(uint32 rtc_second, TimeStamp_FormatTypeDef *realtime_init_struct)
{
static uint32 day_counter = 0;
uint32 days = 0;
uint32 i = 0;
days = rtc_second / DAY_CONVERTTO_SECONEDS;//second to days
if(day_counter != days)
{
day_counter = days;
i = IBM_YEAR_START;
//days to years
while(days >= AVERAGEYEAR_DAYS)
{
if(IS_LEAPYEAR(i))
{
if(days >= LEAPYEAR_DAYS)
{
days-= LEAPYEAR_DAYS;
}
else
{
i++;
break;
}
}
else
{
days -= AVERAGEYEAR_DAYS;
}
i++;
}
realtime_init_struct->year = i;
i = 0;
//days to month
while(days >= AVERAGEYEAR_FEBRUARY_DAYS )
{
if(IS_LEAPYEAR(realtime_init_struct->year) && i == FEBRUARY )
{
if(days >= LEAPYEAR_FEBRUARY_DAYS)
{
days -= LEAPYEAR_FEBRUARY_DAYS;
}
else break;
}
else
{
if(days >= month_table[i])
{
days -= month_table[i];
}
else break;
}
i++;
}
realtime_init_struct->month = i+1;
realtime_init_struct->day = days+1;
}
i = rtc_second % DAY_CONVERTTO_SECONEDS;
realtime_init_struct->week = LPLD_GetWeek(realtime_init_struct);
realtime_init_struct->hour = i / HOUR_CONVERTTO_SECONEDS; //hours
realtime_init_struct->minute = (i % HOUR_CONVERTTO_SECONEDS) / MINUTE_CONVERTTO_SECONEDS; //minutes
realtime_init_struct->second = (i % HOUR_CONVERTTO_SECONEDS) % MINUTE_CONVERTTO_SECONEDS; //seconds
return 1;
}
