Question: Can one offer Salah before its prescribed time for any personal reason?

Answer: It is not permissible on any circumstances to offer Salah before its due time, the Salah time must be strictly followed according to their prescribed time. Thus, Allah swt has mentioned in Surah an-Nisa: verse:103: “Surely, Salāh is an obligation on the believers that is tied up with time”.

However, only exception is that combining Salah in the day of Arafah (combing Asr immediately after Zuhr on Zuhr time thus praying Asr before its due time) is a sunnah provided that you are praying inside the Masjid Namira with jama’ah.  

References: [1] Surah an-Nisa: verse:103 [2] Sahih Muslim, hadith no-1218 [3] Sahih Ibn Khuzaimah, hadith no-2812