June 20th is June 20th everywhere you go. Happy summer solstice too.
No, it isn't. Ask a Muslim or a Chinese person what day it is and you do get a very non-"standard" answer.
You are correct my friend. The Islamic calendar is different. Islamic Date Today 21 Jun, 2024 - Worldwide Islamic date today is 15 Dhul-Hijjah 1445 in Arab countries and other parts of the world. South Asian countries, including Pakistan, India, and Bangladesh, observe the Islamic date as 14 Dhul-Hijjah 1445. The Islamic date, also known as Hijri or Arabic date, follows a lunar calendar with 12 months of 29 or 30 days, totaling 354 or 356 days in a year.