huxi
119 lines
2.4 KiB
C
119 lines
2.4 KiB
C
#include "timestamp.h"
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#define UTC_BASE_YEAR 1970
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#define MONTH_PER_YEAR 12
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#define DAY_PER_YEAR 365
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#define SEC_PER_DAY 86400
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#define SEC_PER_HOUR 3600
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#define SEC_PER_MIN 60
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/* Number of days per month */
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static const u8 days_per_month[MONTH_PER_YEAR] = {
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/*
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1 2 3 4 5 6 7 8 9 10 11 12
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*/
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31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
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};
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static bool get_is_leap_year(u16 year)
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{
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if (((year % 4) == 0) && ((year % 100) != 0)) {
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return 1;
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} else if ((year % 400) == 0) {
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return 1;
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}
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return 0;
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}
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static u8 get_day_of_mon(u8 month, u16 year)
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{
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if ((month == 0) || (month > 12)) {
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return days_per_month[1] + get_is_leap_year(year);
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}
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if (month != 2) {
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return days_per_month[month - 1];
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} else {
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return days_per_month[1] + get_is_leap_year(year);
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}
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}
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void timestamp_utc_sec_2_mytime(u32 utc_sec, struct sys_time *mytime)
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{
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if (mytime == NULL) {
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return;
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}
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int32_t sec, day;
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u16 y;
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u8 m;
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u16 d;
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sec = utc_sec % SEC_PER_DAY;
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mytime->hour = sec / SEC_PER_HOUR;
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sec %= SEC_PER_HOUR;
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mytime->min = sec / SEC_PER_MIN;
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mytime->sec = sec % SEC_PER_MIN;
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day = utc_sec / SEC_PER_DAY;
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for (y = UTC_BASE_YEAR; day > 0; y++) {
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d = (DAY_PER_YEAR + get_is_leap_year(y));
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if (day >= d) {
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day -= d;
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} else {
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break;
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}
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}
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mytime->year = y;
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for (m = 1; m < MONTH_PER_YEAR; m++) {
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d = get_day_of_mon(m, y);
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if (day >= d) {
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day -= d;
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} else {
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break;
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}
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}
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mytime->month = m;
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mytime->day = (u8)(day + 1);
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}
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u32 timestamp_mytime_2_utc_sec(struct sys_time *mytime)
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{
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if (mytime == NULL) {
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return 0;
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}
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u16 i;
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u32 no_of_days = 0;
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u32 utc_time;
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/* u8 dst = 1; */
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if (mytime->year < UTC_BASE_YEAR) {
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return 0;
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}
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for (i = UTC_BASE_YEAR; i < mytime->year; i++) {
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no_of_days += (DAY_PER_YEAR + get_is_leap_year(i));
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}
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for (i = 1; i < mytime->month; i++) {
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no_of_days += get_day_of_mon(i, mytime->year);
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}
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no_of_days += (mytime->day - 1);
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utc_time = (unsigned int) no_of_days * SEC_PER_DAY + (unsigned int)(mytime->hour * SEC_PER_HOUR +
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mytime->min * SEC_PER_MIN + mytime->sec);
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return utc_time;
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}
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