Updated Adafruit Library
Fork of Adafruit_RTCLib by
DateTime.cpp
- Committer:
- nkhorman
- Date:
- 2012-07-17
- Revision:
- 0:7f90c8e04249
File content as of revision 0:7f90c8e04249:
// Code by JeeLabs http://news.jeelabs.org/code/ // Released to the public domain! Enjoy! /* * Taken from https://github.com/adafruit/RTClib * and modified for LPC1768 by Neal Horman July 2012 */ #include "DateTime.h" #define SECONDS_PER_DAY 86400L #define SECONDS_FROM_1970_TO_2000 946684800 //////////////////////////////////////////////////////////////////////////////// // utility code, some of this could be exposed in the DateTime API if needed static const uint8_t daysInMonth [] = { 31,28,31,30,31,30,31,31,30,31,30,31 }; //has to be const or compiler compaints // number of days since 2000/01/01, valid for 2001..2099 static uint16_t date2days(uint16_t y, uint8_t m, uint8_t d) { if (y >= 2000) y -= 2000; uint16_t days = d; for (uint8_t i = 1; i < m; ++i) days += daysInMonth[i - 1]; if (m > 2 && y % 4 == 0) ++days; return days + 365 * y + (y + 3) / 4 - 1; } static long time2long(uint16_t days, uint8_t h, uint8_t m, uint8_t s) { return ((days * 24L + h) * 60 + m) * 60 + s; } //////////////////////////////////////////////////////////////////////////////// // DateTime implementation - ignores time zones and DST changes // NOTE: also ignores leap seconds, see http://en.wikipedia.org/wiki/Leap_second DateTime::DateTime (uint32_t t) { t -= SECONDS_FROM_1970_TO_2000; // bring to 2000 timestamp from 1970 ss = t % 60; t /= 60; mm = t % 60; t /= 60; hh = t % 24; uint16_t days = t / 24; uint8_t leap; for (yOff = 0; ; ++yOff) { leap = yOff % 4 == 0; if (days < 365 + leap) break; days -= 365 + leap; } for (m = 1; ; ++m) { uint8_t daysPerMonth = daysInMonth[m - 1]; if (leap && m == 2) ++daysPerMonth; if (days < daysPerMonth) break; days -= daysPerMonth; } d = days + 1; } DateTime::DateTime (uint16_t year, uint8_t month, uint8_t day, uint8_t hour, uint8_t min, uint8_t sec) { if (year >= 2000) year -= 2000; yOff = year; m = month; d = day; hh = hour; mm = min; ss = sec; } static uint8_t conv2d(const char* p) { uint8_t v = 0; if ('0' <= *p && *p <= '9') v = *p - '0'; return 10 * v + *++p - '0'; } // A convenient constructor for using "the compiler's time": // DateTime now (__DATE__, __TIME__); // NOTE: using PSTR would further reduce the RAM footprint DateTime::DateTime (const char* date, const char* time) { // sample input: date = "Dec 26 2009", time = "12:34:56" yOff = conv2d(date + 9); // Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec switch (date[0]) { case 'J': m = date[1] == 'a' ? 1 : m = date[2] == 'n' ? 6 : 7; break; case 'F': m = 2; break; case 'A': m = date[2] == 'r' ? 4 : 8; break; case 'M': m = date[2] == 'r' ? 3 : 5; break; case 'S': m = 9; break; case 'O': m = 10; break; case 'N': m = 11; break; case 'D': m = 12; break; } d = conv2d(date + 4); hh = conv2d(time); mm = conv2d(time + 3); ss = conv2d(time + 6); } uint8_t DateTime::dayOfWeek() const { uint16_t day = date2days(yOff, m, d); return (day + 6) % 7; // Jan 1, 2000 is a Saturday, i.e. returns 6 } uint32_t DateTime::unixtime(void) const { uint16_t days = date2days(yOff, m, d); return time2long(days, hh, mm, ss) + SECONDS_FROM_1970_TO_2000; // seconds from 1970 to 2000 } #ifdef WANT_RTC_MILLIS //////////////////////////////////////////////////////////////////////////////// // RTC_Millis implementation long RTC_Millis::offset = 0; void RTC_Millis::adjust(const DateTime& dt) { offset = dt.unixtime() - millis() / 1000; } DateTime RTC_Millis::now() { return (uint32_t)(offset + millis() / 1000); } //////////////////////////////////////////////////////////////////////////////// #endif