Two Thirty
Half Past Two
noun
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.
二時半ぐらい
about 2:30
二時半まで
until 2:30
二時半から
from 2:30
今、もう二時半ですよ。
It's already 2:30 now.
今日は二時半から科学のクラスです。
Today, I have a science class at 2:30.
次の東京行きのバスは、二時半です。
The next bus to Tokyo is at 2:30.