5點半的英語口語是 half past five,
注意:half after five是錯誤的用法!
P.S. 請帖上面可以寫"half after five o'clock"要記得加o'clock!
https://reurl.cc/4oLvMX
Time of day should be spelled out as “four o'clock” or “half after four
o'clock.” Note that “half after” is the most traditional way to indicate
time. However, less formal invitations can use “half past four o'clock” or
“four-thirty.”