#include <iostream>
#include <ctime>
#include <time.h>
 
 
using namespace std;
 
 
 
 
int main() {
 
    time_t now = time(0);
	struct tm ltm;
	localtime_r(&now, &ltm);
	uint8_t bTime[4];
	uint8_t year = (ltm.tm_year >= 100) ? (ltm.tm_year - 100) : 0;
	uint8_t month = ltm.tm_mon + 1; // 1-12
	uint8_t day = ltm.tm_mday;     // 1-31
 
	uint32_t packed = 0;
	packed |= (year & 0x7F) << 25;  // 7 bit
	packed |= (month & 0x0F) << 21; // 4 bit
	packed |= (day & 0x1F) << 16;   // 5 bit
	packed |= (ltm.tm_hour & 0x1F) << 11; // 5 bit
	packed |= (ltm.tm_min & 0x3F) << 5;   // 6 bit
	packed |= (ltm.tm_sec & 0x1F);         // 5 bit
 
	bTime[0] = (packed >> 24) & 0xFF;
	bTime[1] = (packed >> 16) & 0xFF;
	bTime[2] = (packed >> 8) & 0xFF;
	bTime[3] = packed & 0xFF;
 
	return 0;
}

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1 1
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