How do you say good day to a man in Thai?

To say "good day" to a man in Thai, you can say "สวัสดีครับ" (sawasdee khrap). The Word "สวัสดี" (sawasdee) means "hello" or "good day," and "ครับ" (khrap) is a polite particle used by men. This greeting is appropriate for both formal and informal situations.