If it says "that December", I would understand that it was an action that started and finished in the past. Therefore, past simple would be the appropriate tense to use, not the present perfect.
17 Ocak 2021
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You're welcome! 👍🏼
17 Ocak 2021
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Hâlâ cevap bulamadın mı?
Sorularını yaz ve ana dil konuşanlar sana yardım etsin!