diff options
Diffstat (limited to 'include/ntp_calendar.h')
| -rw-r--r-- | include/ntp_calendar.h | 24 |
1 files changed, 21 insertions, 3 deletions
diff --git a/include/ntp_calendar.h b/include/ntp_calendar.h index 41c58797b2c7..0b1f20d6bd7b 100644 --- a/include/ntp_calendar.h +++ b/include/ntp_calendar.h @@ -93,6 +93,7 @@ extern systime_func_ptr ntpcal_set_timefunc(systime_func_ptr); #define SECSPERLEAPYEAR (366 * SECSPERDAY) /* leap year */ #define SECSPERAVGYEAR 31556952 /* mean year length over 400yrs */ +#define GPSWEEKS 1024 /* GPS week cycle */ /* * Gross hacks. I have illicit knowlege that there won't be overflows * here, the compiler often can't tell this. @@ -404,14 +405,21 @@ basedate_get_eracenter(void); extern time_t basedate_get_erabase(void); +extern uint32_t +basedate_get_gpsweek(void); + +extern uint32_t +basedate_expand_gpsweek(unsigned short weekno); /* * Additional support stuff for Ed Rheingold's calendrical calculations */ /* - * Start day of NTP time as days past the imaginary date 12/1/1 BC. - * (This is the beginning of the Christian Era, or BCE.) + * Start day of NTP time as days past 0000-12-31 in the proleptic + * Gregorian calendar. (So 0001-01-01 is day number 1; this is the Rata + * Die counting scheme used by Ed Rheingold in his book "Calendrical + * Calculations".) */ #define DAY_NTP_STARTS 693596 @@ -421,14 +429,24 @@ basedate_get_erabase(void); #define DAY_UNIX_STARTS 719163 /* + * Start day of the GPS epoch. This is the Rata Die of 1980-01-06 + */ +#define DAY_GPS_STARTS 722819 + +/* * Difference between UN*X and NTP epoch (25567). */ #define NTP_TO_UNIX_DAYS (DAY_UNIX_STARTS - DAY_NTP_STARTS) /* + * Difference between GPS and NTP epoch (29224) + */ +#define NTP_TO_GPS_DAYS (DAY_GPS_STARTS - DAY_NTP_STARTS) + +/* * Days in a normal 4 year leap year calendar cycle (1461). */ -#define GREGORIAN_NORMAL_LEAP_CYCLE_DAYS (3 * 365 + 366) +#define GREGORIAN_NORMAL_LEAP_CYCLE_DAYS (4 * 365 + 1) /* * Days in a normal 100 year leap year calendar (36524). We lose a |