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movement: implement time zone setting

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This commit is contained in:
Joey Castillo
2021-11-25 10:06:49 -05:00
parent 4a71def034
commit 5c3967aea2
5 changed files with 71 additions and 5 deletions
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6
watch-library/watch/watch_utility.c
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@@ -51,6 +51,7 @@ uint32_t watch_utility_convert_to_unix_time(uint16_t year, uint8_t month, uint8_
334 // December
};
printf("input: %d/%d/%d %d:%02d:%02d offset by %ld\n", year, month, day, hour, minute, second, utc_offset);
uint32_t year_adj = year + 4800;
uint32_t febs = year_adj - (month <= 2 ? 1 : 0); /* Februaries since base. */
@@ -59,9 +60,12 @@ uint32_t watch_utility_convert_to_unix_time(uint16_t year, uint8_t month, uint8_
days -= 2472692; /* Adjust to Unix epoch. */
uint32_t timestamp = days * 86400;
timestamp += (hour + utc_offset) * 3600;
timestamp += hour * 3600;
timestamp += minute * 60;
timestamp += second;
printf("timestamp was %ld.\ntimezone is %ld.\n", timestamp, utc_offset);
timestamp -= utc_offset;
printf("timestamp now %ld.\n\n", timestamp);
return timestamp;
}

1
watch-library/watch/watch_utility.h
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@@ -46,6 +46,7 @@ const char * watch_utility_get_weekday(watch_date_time date_time);
* @param hour The hour of the date you wish to convert.
* @param minute The minute of the date you wish to convert.
* @param second The second of the date you wish to convert.
* @param utc_offset The number of seconds that date_time is offset from UTC, or 0 if the time is UTC.
* @return A UNIX timestamp for the given date/time and UTC offset.
* @note Implemented by Wesley Ellis (tahnok) and based on BSD-licensed code by Josh Haberman:
* https://blog.reverberate.org/2020/05/12/optimizing-date-algorithms.html