Thread: Minute Delay Loop

I'm needing minutes to always be 00 seconds. But after running my code for a few minutes, it jumps to 58 seconds. I cannot see any reason why. Anyone have any ideas? Thanks.

Code:

#include <windows.h>
#include <ctime>
#include <iostream>// cout

using namespace std;

int main(){
	string dataStr;
	clock_t cSecs; time_t tSecs;
	int Secs,elapsedTime=0,iStall=1;
	Secs=(60-((int)time(0)%60))*1000;// first 00
	bool looping=true;
	while(looping){
		Sleep(Secs); cSecs=clock(); tSecs=time(0);
		char timestamp[20]; struct tm pSecs;
		localtime_s(&pSecs,&tSecs);
		strftime(timestamp, 20, "%X", &pSecs);
		cout << Secs <<" + "<< elapsedTime <<"\t= "<< timestamp <<"\n";
		Sleep(753*(iStall%5)); iStall++;
		elapsedTime=(clock()-cSecs)*1000/CLOCKS_PER_SEC;
		Secs=(60000-elapsedTime);
	}
	return 0;
}