Hijri and Gregorian calendar
The Hijri calendar depends on the change in the shape of the moon during the crescent or full moon, and the Hijri year consists of 354 days, which corresponds to 12 months, and they are, in order: Muharram, Safar, Rabi’ al-Awwal, Rabi’ al-Thani, Jumada al-Awwal, Jumada al-Thani, Rajab, Sha’ban, and Ramadan Shawwal, Dhul-Qa’dah, and Dhul-Hijjah.
The Gregorian calendar depends on the Earth’s rotation around the sun, and the Gregorian year consists of approximately 365 days, corresponding to 12 months, arranged as follows: January, February, March, April, May, June, July, August, September, October, November, and December The first, but how can we convert the date from Hijri to Gregorian or vice versa? How can we also calculate the age in Hijri?
Hijri age calculator
To calculate the age in Hijri, it is necessary first to convert the date of birth from Gregorian to Hijri, taking into account the following matters:
- The first Hijri year was in 621 AD.
- The Hijri year is 11 days shorter than the Gregorian year.
- Steps to convert from Gregorian to Hijri:
- We subtract the year of birth (example 2000) from the Gregorian year for the start of the migration, i.e. 621, as follows: 621 – 2000 = -1379.
- We divide (103/100) = 1.03.
- We multiply the product of the subtraction 1379 by the quotient result of 1.03, i.e. 1379 x 1.03 = 1420.37 Hijri, which is the year of birth in Hijri for which the age is to be calculated. are rounded.
- Calculating the age in Hijri:
- We subtract the Hijri year of birth from the current Hijri year, ie: 1436 (the current year) – 1420 (the Hijri year of birth) = 16 Hijri years
- If we want to calculate the age in AD, we find 2015 – 2000 = 15 Gregorian years.
We note that the age difference is approximately one year between age in Gregorian and age in Hijri, and this is caused by the presence of eleven days difference between the Hijri year and the Gregorian year.
- Converting from Hijri to Gregorian
- We multiply the current Hijri date by the division product (100/103) and then add the result with the Gregorian year for the start of the migration (621).
1436 x (100/103) + 621 = 2015.17 AD, and as we mentioned previously, if tenths are greater than 0.5, it should be rounded to a year, otherwise not.
How do I calculate age in Hijri?