Well, the Hijri date 20 Muharram 1378 corresponds to the Gregorian date Tuesday, 5 August 1958. This date lies in the first month of the Hijri year 1378 AH, which is Muharram of 1378 AH. Both this Hijri and Gregorian date occur on the single day that is Tuesday without any doubt. The Arabic date 1378/01/20 is calculated using the Umm Al-Qura calendar and the sighting of the moon. One thing to remember is that this Arabic date may occur on different Gregorian date depending upon the region and country and obviously the moon.
If you are still not sure about the date then you can use our Arabic date converter.
The following is the conversion of the Gregorian date 5 August 1958 to its equivalent Arabic date.
The following is the conversion of the Arabic date 20 Muharram 1378 AH to its equivalent Gregorian date.
وَمِنَ ٱلَّذِينَ قَالُوٓا۟ إِنَّا نَصَٰرَىٰٓ أَخَذْنَا مِيثَٰقَهُمْ فَنَسُوا۟ حَظًّۭا مِّمَّا ذُكِّرُوا۟ بِهِۦ فَأَغْرَيْنَا بَيْنَهُمُ ٱلْعَدَاوَةَ وَٱلْبَغْضَآءَ إِلَىٰ يَوْمِ ٱلْقِيَٰمَةِ ۚ وَسَوْفَ يُنَبِّئُهُمُ ٱللَّهُ بِمَا كَانُوا۟ يَصْنَعُونَ
And with those who say: "Lo! we are Christians," We made a covenant, but they forgot a part of that whereof they were admonished. Therefor We have stirred up enmity and hatred among them till the Day of Resurrection, when Allah will inform them of their handiwork.
Surah Al-Maaida(5:14)
Sahih al-Bukhari
Invocations
Chapter: To invoke Allah against Al-Mushrikun
Narrated Anas:
The Prophet (ﷺ) sent a Sariya (an army detachment) consisting of men called Al-Qurra', and all of them were martyred. I had never seen the Prophet (ﷺ) so sad over anything as he was over them. So he said Qunut (invocation in the prayer) for one month in the Fajr prayer, invoking for Allah's wrath upon the tribe of 'Usaiya, and he used to say, "The people of 'Usaiya have disobeyed Allah and His Apostle."
Sahih al-Bukhari 6394