The film begins at two-thirty.
I have an important appointment at 2:30, but I overslept and now I'm freaking out.
"I’m meeting my mom’s father’s daughter’s niece tomorrow at two-thirty in the afternoon." "Why didn’t you just say you’re meeting your older sister for lunch tomorrow? Jeez!"
When it's two o'clock and a half what time do you think it is? That would be two thirty.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.