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lib/timeutils: Add helper functions to deal with nanosecs since 1970. 

Signed-off-by: Damien George <damien@micropython.org>
This commit is contained in:
Damien George 2020-08-02 00:32:38 +10:00
parent 92899354d9
commit badd351150
1 changed files with 18 additions and 0 deletions
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18
lib/timeutils/timeutils.h
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@ -27,6 +27,10 @@
#ifndef MICROPY_INCLUDED_LIB_TIMEUTILS_TIMEUTILS_H
#define MICROPY_INCLUDED_LIB_TIMEUTILS_TIMEUTILS_H
// The number of seconds between 1970/1/1 and 2000/1/1 is calculated using:
// time.mktime((2000,1,1,0,0,0,0,0,0)) - time.mktime((1970,1,1,0,0,0,0,0,0))
#define TIMEUTILS_SECONDS_1970_TO_2000 (946684800ULL)
typedef struct _timeutils_struct_time_t {
uint16_t tm_year; // i.e. 2014
uint8_t tm_mon; // 1..12
@ -38,6 +42,14 @@ typedef struct _timeutils_struct_time_t {
uint16_t tm_yday; // 1..366
} timeutils_struct_time_t;
static inline uint64_t timeutils_seconds_since_2000_to_nanoseconds_since_1970(mp_uint_t s) {
return ((uint64_t)s + TIMEUTILS_SECONDS_1970_TO_2000) * 1000000000ULL;
}
static inline mp_uint_t timeutils_seconds_since_2000_from_nanoseconds_since_1970(uint64_t ns) {
return ns / 1000000000ULL - TIMEUTILS_SECONDS_1970_TO_2000;
}
bool timeutils_is_leap_year(mp_uint_t year);
mp_uint_t timeutils_days_in_month(mp_uint_t year, mp_uint_t month);
mp_uint_t timeutils_year_day(mp_uint_t year, mp_uint_t month, mp_uint_t date);
@ -51,4 +63,10 @@ mp_uint_t timeutils_seconds_since_2000(mp_uint_t year, mp_uint_t month,
mp_uint_t timeutils_mktime(mp_uint_t year, mp_int_t month, mp_int_t mday,
mp_int_t hours, mp_int_t minutes, mp_int_t seconds);
static inline uint64_t timeutils_nanoseconds_since_1970(mp_uint_t year, mp_uint_t month,
mp_uint_t date, mp_uint_t hour, mp_uint_t minute, mp_uint_t second) {
return timeutils_seconds_since_2000_to_nanoseconds_since_1970(
timeutils_seconds_since_2000(year, month, date, hour, minute, second));
}
#endif // MICROPY_INCLUDED_LIB_TIMEUTILS_TIMEUTILS_H