What is the difference between "Arigato godzaimas" and "Arigato godzaimashta"?
「ありがとうございます　と　ありがとうございました」

Question

What is the difference between "Arigato godzaimas" and "Arigato godzaimashta"? 
「ありがとうございます　と　ありがとうございました」

Answer

（Domo） Arigatou Gozaimashita (どうも）ありがとうございました　is in the past tense all right. But when you say thank you automatically  it is a past tense. Don't you think so?

Grammatically speaking you're suppose to say ありがとうございました but there's no problem in saying ありがとうございます　either. Oh, by the way, sometimes I only use domo （どうも~）.

Answer

grammatically, the second one is in the past tense. I don't know if it has a subtly different meaning or not.

집에서 편안하게 언어를 배울 수 있는 기회를 놓치지 마세요. 경험 많은 강사진을 살펴보고 지금 바로 첫 수업을 신청하세요!