Convert Seconds variable into Hours Minutes Seconds

Basically, use modulos and divisions

Here is a quick function that could help you

void secondsToHMS( const uint32_t seconds, uint16_t &h, uint8_t &m, uint8_t &s )
{
    uint32_t t = seconds;

    s = t % 60;

    t = (t - s)/60;
    m = t % 60;

    t = (t - m)/60;
    h = t;
}