[En-Nut-Discussion] Fwd: RTC function reciprocal

[Henrik Maier]

The Dallas/Maxim Application Note 517 covers this topic and publishes 
the following routine:

unsigned long DS1371_DateToBinary(tm_struct *datetime) {

	unsigned long iday;
	unsigned long val;

	iday = 365 * (datetime->tm_year - 70) + DaysToMonth[datetime->tm_mon] + 
(datetime->tm_mday - 1);
	iday = iday + (datetime->tm_year - 69) / 4;
	if ((datetime->tm_mon > 1) && ((datetime->tm_year % 4) == 0)) {
		iday++;
	}
	val = datetime->tm_sec + 60 * datetime->tm_min + 3600 * 
(datetime->tm_hour + 24 * iday);
	return val;
}


The full code can be obtained from:

ftp://ftp.dalsemi.com/pub/timekeeping/DS1371/


Henrik Maier



Harald Kipp wrote:
> Forwarded to the list:
> 
> 
>> Date: Tue, 20 Dec 2005 08:08:54 +1000
>> From: Don Ingram
>>
>> Hi All,
>>
>> Would anyone have some code close at hand to provide the reciprocal of 
>> the
>> localtime_r() function so that we can convert a _tm time struct to 
>> seconds to
>> set the nut time.
>>
>> Not so much lazy as very stretched for time ;-)
>>
>> -- 
>> Cheers & thanks
>>
>> Don
>>
>>
> 
> 
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