Well, the Hijri date 11 Dhul Hijjah 1408 corresponds to the Gregorian date Sunday, 24 July 1988. This date lies in the twelfth month of the Hijri year 1408 AH, which is Dhu Al-Hijjah of 1408 AH. Both this Hijri and Gregorian date occur on the single day that is Sunday without any doubt. The Arabic date 1408/12/11 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 24 July 1988 to its equivalent Arabic date.
The following is the conversion of the Arabic date 11 Dhul Hijjah 1408 AH to its equivalent Gregorian date.
وَقِيلَ لِلنَّاسِ هَلْ أَنتُم مُّجْتَمِعُونَ
And it was said unto the people: Are ye (also) gathering?
Surah Ash-Shu'araa(26:39)
Sahih al-Bukhari
Merits of the Helpers in Madinah (Ansaar)
Chapter: Al-Qasama in the Pre-Islamic Period of Ignorance
Narrated 'Aisha:
Allah caused the day of Buath to take place before Allah's Messenger (ﷺ) was sent (as an Apostle) so that when Allah's Messenger (ﷺ) reached Medina, those people had already divided (in different groups) and their chiefs had been killed or wounded. So Allah made that day precede Allah's Messenger (ﷺ) so that they (i.e. the Ansar) might embrace Islam.
Sahih al-Bukhari 3846