Is it permissible to pray Dhuhr in congregation at the mosque at 14:15 and Asr prayer at 14:50, knowing that the Dhuhr adhan is at 12:17?

The Sharia has appointed for prayer times a beginning and an end, with detailed signs. The time for Asr begins after the end of the Dhuhr time. Determining by the hour differs from country to country and season to season, and it is not permissible to rely on it except in accordance with the Sharia signs. One may use reliable calendars for assistance.