#include <stdio.h>

main()
{
   long int time;
   int i,j,c,n,base_year;
   char sd[9],st[9],s[20];

   printf(" Please enter the time in seconds: ");
   gets(s);
   time = atoi(s);
   printf(" Please enter the baseline year (default = 70): ");
   gets(s);
   if ( s[0] == '\0' )
     base_year = 70;
   else {
     base_year = atoi(s);
     if (base_year > 1900) base_year = base_year - 1900; 
   }
   date(sd,st,time,base_year);
   printf("\n %9s %9s\n",sd,st);
}

date (sd, st, itime, base_year)

char sd[],st[];
long int itime;
int base_year;
{
   long int itime2;
   int mon,day,yr,tday,i,ndays=365,ind;
   int hr,min,sec;
   static int julian[2][12] = {
          {1,32,60,91,121,152,182,213,244,274,305,335}, 
          {1,32,61,92,122,153,183,214,245,275,306,336}};

   yr = base_year;
   itime2 = itime;
   while ((itime2 - ndays*86400) > 0) {
     yr = yr + 1;
     itime2 = itime2 - ndays*86400;
     if (yr%4 == 0) 
       ndays = 366;
     else
       ndays = 365;
   }
   if (yr%4 == 0)
      ind = 1;
   else
      ind = 0;
   mon = 12;
   tday = itime2/86400;
   for (i=1; i<=12; i++) {
      if (julian[ind][i-1] > tday+1) {
         mon = i-1;
         break;
      }
   }
   day = tday - julian[ind][mon-1] + 2;
   itime2 = itime2 - (julian[ind][mon-1]+day-2)*86400;
   hr = itime2/3600;
   itime2 = itime2 - hr*3600;
   min = itime2/60;
   itime2 = itime2 - min*60;
   sec = itime2;

   sd[0] = '0' + (mon/10);
   sd[1] = '0' + (mon%10);
   sd[2] = '-';
   sd[3] = '0' + (day/10);
   sd[4] = '0' + (day%10);
   sd[5] = '-';
   sd[6] = '0' + (yr/10);
   sd[7] = '0' + (yr%10);
   sd[8] = '\0';

   st[0] = '0' + (hr/10);
   st[1] = '0' + (hr%10);
   st[2] = ':';
   st[3] = '0' + (min/10);
   st[4] = '0' + (min%10);
   st[5] = ':';
   st[6] = '0' + (sec/10);
   st[7] = '0' + (sec%10);
   st[8] = '\0';

   return(1);
}