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Fill out watch_utility_convert_to_unix_time

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This commit is contained in:
Wesley Ellis 2021-11-23 21:32:25 -05:00
parent f9e3dc865d
commit 653dd862b8
1 changed files with 28 additions and 2 deletions
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30
watch-library/watch/watch_utility.c
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@ -36,8 +36,34 @@ const char * watch_utility_get_weekday(watch_date_time date_time) {
}
uint32_t watch_utility_convert_to_unix_time(uint16_t year, uint8_t month, uint8_t day, uint8_t hour, uint8_t minute, uint8_t second, uint32_t utc_offset) {
// TODO
return 0;
uint16_t DAYS_SO_FAR[] = {
0, // Jan
31, // Feb
59, // March
90, // April
120, // May
151, // June
181, // July
212, // August
243, // September
273, // October
304, // November
334 // December
};
uint32_t year_adj = year + 4800;
uint32_t febs = year_adj - (month <= 2 ? 1 : 0); /* Februaries since base. */
uint32_t leap_days = 1 + (febs / 4) - (febs / 100) + (febs / 400);
uint32_t days = 365 * year_adj + leap_days + DAYS_SO_FAR[month - 1] + day - 1;
days -= 2472692; /* Adjust to Unix epoch. */
uint32_t timestamp = days * 86400;
timestamp += (hour + utc_offset) * 3600;
timestamp += minute * 60;
timestamp += second;
return timestamp;
}
uint32_t watch_utility_date_time_to_unix_time(watch_date_time date_time, uint32_t utc_offset) {