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Time now auto-updates with DST

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This commit is contained in:
David Volovskiy
2024-08-02 01:23:21 -04:00
parent 2ce07f9539
commit 149911e4ad
7 changed files with 105 additions and 16 deletions
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33
watch-library/shared/watch/watch_utility.c
View File

@@ -83,6 +83,39 @@ uint8_t is_leap(uint16_t y)
return !(y%4) && ((y%100) || !(y%400));
}
uint8_t is_dst(watch_date_time date_time) {
uint8_t weekday_first_of_month;
watch_date_time dst_start_time;
watch_date_time dst_end_time;
uint32_t unix_dst_start_time;
uint32_t unix_dst_end_time;
uint32_t unix_curr_time;
dst_start_time.unit.month = 3;
dst_start_time.unit.hour = 2;
dst_start_time.unit.minute = 0;
dst_start_time.unit.second = 0;
weekday_first_of_month = watch_utility_get_iso8601_weekday_number(date_time.unit.year, dst_start_time.unit.month, 1);
dst_start_time.unit.day = 15 - weekday_first_of_month;
unix_dst_start_time = watch_utility_date_time_to_unix_time(dst_start_time, 0);
dst_end_time.unit.month = 11;
dst_end_time.unit.hour = 2;
dst_end_time.unit.minute = 0;
dst_end_time.unit.second = 0;
weekday_first_of_month = watch_utility_get_iso8601_weekday_number(date_time.unit.year, dst_end_time.unit.month, 1);
dst_end_time.unit.day = 15 - weekday_first_of_month;
unix_dst_end_time = watch_utility_date_time_to_unix_time(dst_end_time, 0);
date_time.unit.second = 0;
unix_curr_time = watch_utility_date_time_to_unix_time(date_time, 0);
if (unix_curr_time == unix_dst_start_time) return DST_STARTED;
if (unix_curr_time == unix_dst_end_time) return DST_ENDING;
if (unix_curr_time > unix_dst_end_time || unix_curr_time < unix_dst_start_time) return DST_ENDED;
return DST_OCCURRING;
}
uint16_t watch_utility_days_since_new_year(uint16_t year, uint8_t month, uint8_t day) {
uint16_t DAYS_SO_FAR[] = {
0, // Jan

13
watch-library/shared/watch/watch_utility.h
View File

@@ -45,6 +45,13 @@ typedef struct {
uint32_t days; // 0-4294967295
} watch_duration_t;
typedef enum {
DST_STARTED,
DST_OCCURRING,
DST_ENDING,
DST_ENDED
} dst_t;
/** @brief Returns a two-letter weekday for the given timestamp, suitable for display
* in positions 0-1 of the watch face
* @param date_time The watch_date_time whose weekday you want.
@@ -78,6 +85,12 @@ uint16_t watch_utility_days_since_new_year(uint16_t year, uint8_t month, uint8_t
*/
uint8_t is_leap(uint16_t year);
/** @brief Returns off of dst_t based off if DST is occurring, srted, ended, or none of those.
* @param date_time The watch_date_time that you wish to convert.
* @return DST_OCCURRING, DST_HAPPENING, DST_ENDING, DST_ENDED
*/
uint8_t is_dst(watch_date_time date_time);
/** @brief Returns the UNIX time (seconds since 1970) for a given date/time in UTC.
* @param date_time The watch_date_time that you wish to convert.
* @param year The year of the date you wish to convert.