configTime sets up the SNTP client. The source code (from Github) should make its use clear:
void configTime(int timezone, int daylightOffset_sec, const char* server1, const char* server2, const char* server3)
{
sntp_stop();
setServer(0, server1);
setServer(1, server2);
setServer(2, server3);
sntp_set_timezone(timezone/3600);
sntp_set_daylight(daylightOffset_sec);
sntp_init();
}