Need Guide @ Guildcombat

anyone knows whats the meaning of 1 18 30? i just wanna set the Gs time every 9 hours please help ^_^
AUTO_OPEN_IDC
{
1 18 30 // Sunday 18:30
2 18 30 // Monday 18:30
3 18 30 // Tuesday 18:30
4 18 30 // Wed. 18:30
5 18 30 // Thursday 18:30
6 18 30 // Friday 18:30
7 18 30 // Saturday 18:30
}

1 = sunday (1 sunday, 2 monday, 3 tuesday 4 wednesday, 5 thursday, 6 friday, 7 saturday)18 = hour
30 = minute