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change year base for RTC time_t to correct leap processing

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Merge pull request #3307 from iNavFlight/jh_fix_rtc_leap_offset
This commit is contained in:
stronnag 2018-06-01 09:10:48 +01:00 • committed by mikeller
parent 4466c6f5e3
commit f298a4ad45
1 changed files with 10 additions and 6 deletions
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16
src/main/common/time.c
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@ -36,7 +36,11 @@
#ifdef USE_RTC_TIME
#define UNIX_REFERENCE_YEAR 1970
// For the "modulo 4" arithmetic to work, we need a leap base year
#define REFERENCE_YEAR 2000
// Offset (seconds) from the UNIX epoch (1970-01-01) to 2000-01-01
#define EPOCH_2000_OFFSET 946684800
#define MILLIS_PER_SECOND 1000
// rtcTime_t when the system was started.
@ -64,14 +68,14 @@ static rtcTime_t dateTimeToRtcTime(dateTime_t *dt)
unsigned int hour = dt->hours; // 0-23
unsigned int day = dt->day - 1; // 0-30
unsigned int month = dt->month - 1; // 0-11
unsigned int year = dt->year - UNIX_REFERENCE_YEAR; // 0-99
int32_t unixTime = (((year / 4 * (365 * 4 + 1) + days[year % 4][month] + day) * 24 + hour) * 60 + minute) * 60 + second;
unsigned int year = dt->year - REFERENCE_YEAR; // 0-99
int32_t unixTime = (((year / 4 * (365 * 4 + 1) + days[year % 4][month] + day) * 24 + hour) * 60 + minute) * 60 + second + EPOCH_2000_OFFSET;
return rtcTimeMake(unixTime, dt->millis);
}
static void rtcTimeToDateTime(dateTime_t *dt, rtcTime_t t)
{
int32_t unixTime = t / MILLIS_PER_SECOND;
int32_t unixTime = t / MILLIS_PER_SECOND - EPOCH_2000_OFFSET;
dt->seconds = unixTime % 60;
unixTime /= 60;
dt->minutes = unixTime % 60;
@ -96,7 +100,7 @@ static void rtcTimeToDateTime(dateTime_t *dt, rtcTime_t t)
}
}
dt->year = years + year + UNIX_REFERENCE_YEAR;
dt->year = years + year + REFERENCE_YEAR;
dt->month = month + 1;
dt->day = unixTime - days[year][month] + 1;
dt->millis = t % MILLIS_PER_SECOND;
@ -115,7 +119,7 @@ static void rtcGetDefaultDateTime(dateTime_t *dateTime)
static bool rtcIsDateTimeValid(dateTime_t *dateTime)
{
return (dateTime->year >= UNIX_REFERENCE_YEAR) &&
return (dateTime->year >= REFERENCE_YEAR) &&
(dateTime->month >= 1 && dateTime->month <= 12) &&
(dateTime->day >= 1 && dateTime->day <= 31) &&
(dateTime->hours <= 23) &&