=IF(INT((COLUMN()-1)/2)<10,"0","")&INT((COLUMN()-1)/2)&":"&IF(MOD(COLUMN(),2)=1,"01","31")&" ~ "&IF(INT((COLUMN()-1)/2)<10,"0","")&INT((COLUMN())/2)&":"&IF(MOD(COLUMN(),2)=1,"30","00")

00:01 ~ 00:30
00:31 ~ 01:00
01:01 ~ 01:30
01:31 ~ 02:00
02:01 ~ 02:30

Posted by 투덜ⓔ