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 We do not have one calendar. 

We do not need to conflate our mediums of exchange with the sun and moon. 

We don't need any mediums of exchange, but we sure do need the sun and moon.  
 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.