[elektro] localtime gond

[zulu]

2016-09-15 09:28 keltezéssel, SZIGETI Szabolcs írta:
> Ezeket mondjuk mondhattad volna előbb is :-)

copy - paste:

#define NTP_PACKET_SIZE 48
char packetBuffer[ NTP_PACKET_SIZE ];

// ntp packetben 0x20...0x23 címen van a receive timestamp sec. pontossággal (by wireshark)

struct tm  ts;

uint32_t secsSince1900
=((uint32_t)packetBuffer[0x20]<<24)|((uint32_t)packetBuffer[0x21]<<16)|((uint32_t)packetBuffer[0x22]<<8)|((uint32_t)packetBuffer[0x23]);

/*
Ellenörzés végett az alábbi sorokban visszaszámoltam a pontos idöt, ami tökéletes.
hour = ( ( epoch  % 86400L ) / 3600 )+2;
minute = ( epoch  % 3600 ) / 60;
second = epoch % 60;
*/

const uint32_t seventyYears = 2208988800UL;
unsigned long epoch = secsSince1900 - seventyYears;
ts = *localtime( &epoch );
printf( "%04i-%02i-%02i, %1i", ts.tm_year+1900, ts.tm_mon+1, ts.tm_mday, ts.tm_wday );

-zulu