Well, the Hijri date 21 Safar 1398 corresponds to the Gregorian date Monday, 30 January 1978. This date lies in the second month of the Hijri year 1398 AH, which is Safar of 1398 AH. Both this Hijri and Gregorian date occur on the single day that is Monday without any doubt. The Arabic date 1398/02/21 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 30 January 1978 to its equivalent Arabic date.
The following is the conversion of the Arabic date 21 Safar 1398 AH to its equivalent Gregorian date.
فَتَقَبَّلَهَا رَبُّهَا بِقَبُولٍ حَسَنٍۢ وَأَنۢبَتَهَا نَبَاتًا حَسَنًۭا وَكَفَّلَهَا زَكَرِيَّا ۖ كُلَّمَا دَخَلَ عَلَيْهَا زَكَرِيَّا ٱلْمِحْرَابَ وَجَدَ عِندَهَا رِزْقًۭا ۖ قَالَ يَٰمَرْيَمُ أَنَّىٰ لَكِ هَٰذَا ۖ قَالَتْ هُوَ مِنْ عِندِ ٱللَّهِ ۖ إِنَّ ٱللَّهَ يَرْزُقُ مَن يَشَآءُ بِغَيْرِ حِسَابٍ
And her Lord accepted her with full acceptance and vouchsafed to her a goodly growth; and made Zachariah her guardian. Whenever Zachariah went into the sanctuary where she was, he found that she had food. He said: O Mary! Whence cometh unto thee this (food)? She answered: It is from Allah. Allah giveth without stint to whom He will.
Surah Aal-i-Imraan(3:37)