Well, the Hijri date 21 Rajab 1357 corresponds to the Gregorian date Thursday, 15 September 1938. This date lies in the seventh month of the Hijri year 1357 AH, which is Rajab of 1357 AH. Both this Hijri and Gregorian date occur on the single day that is Thursday without any doubt. The Arabic date 1357/07/21 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 15 September 1938 to its equivalent Arabic date.
The following is the conversion of the Arabic date 21 Rajab 1357 AH to its equivalent Gregorian date.
فَوَسْوَسَ لَهُمَا ٱلشَّيْطَٰنُ لِيُبْدِىَ لَهُمَا مَا وُۥرِىَ عَنْهُمَا مِن سَوْءَٰتِهِمَا وَقَالَ مَا نَهَىٰكُمَا رَبُّكُمَا عَنْ هَٰذِهِ ٱلشَّجَرَةِ إِلَّآ أَن تَكُونَا مَلَكَيْنِ أَوْ تَكُونَا مِنَ ٱلْخَٰلِدِينَ
Then Satan whispered to them that he might manifest unto them that which was hidden from them of their shame, and he said: Your Lord forbade you from this tree only lest ye should become angels or become of the immortals.
Surah Al-A'raaf(7:20)
Sahih al-Bukhari
Military Expeditions led by the Prophet (pbuh) (Al-Maghaazi)
Chapter: Ghazwa of Khaibar
Narrated Abu Huraira:
When we conquered Khaibar, we gained neither gold nor silver as booty, but we gained cows, camels, goods and gardens. Then we departed with Allah's Messenger (ﷺ) to the valley of Al-Qira, and at that time Allah's Messenger (ﷺ) had a slave called Mid`am who had been presented to him by one of Banu Ad-Dibbab. While the slave was dismounting the saddle of Allah's Messenger (ﷺ) an arrow the thrower of which was unknown, came and hit him. The people said, "Congratulations to him for the martyrdom." Allah's Apostle said, "No, by Him in Whose Hand my soul is, the sheet (of cloth) which he had taken (illegally) on the day of Khaibar from the booty before the distribution of the booty, has become a flame of Fire burning him." On hearing that, a man brought one or two leather straps of shoes to the Prophet and said, "These are things I took (illegally)." On that Allah's Messenger (ﷺ) said, "This is a strap, or these are two straps of Fire."
Sahih al-Bukhari 4234