void update_time_in_buffer(void)
{
  int buffer_time_dec, t4;  //just two temp. var.
// Convert 20h53m to 2053
  buffer_time_dec = count_hours_for_clock*100 + count_minutes_for_clock;
// For 4 digit
    for (t4=4;t4!=0;t4--)
    {
// Next, we replace the image of the digit and restore the position on the screen
     buffer_line_to_leds [t4-1] = ((dec_digit_to_7_seg_led [buffer_time_dec % 10])<<8) + (0x01<<(8-t4));
     buffer_time_dec = buffer_time_dec / 10;
    }
// Next, turn on the "dot" between the hours and minutes.
buffer_line_to_leds[2] = buffer_line_to_leds [2] & 0xFEFF;

// Last, we turn off 0 if it is in the first position.
if((buffer_line_to_leds[0] & 0xFF00) == 0x0300) buffer_line_to_leds [0] = 0xFF00;
}