<P> The Bangla calendar, used in Bangladesh, follows solar months and it has six seasons . The months and seasons in the calendar are: </P> <Table> <Tr> <Th> No . </Th> <Th> Name </Th> <Th> Bengali season </Th> <Th> Days </Th> <Th> Julian months </Th> </Tr> <Tr> <Td> </Td> <Td> Boishakh (বৈশাখ) </Td> <Td> Grishmo (গ্রীষ্ম) </Td> <Td> 31 </Td> <Td> 14 April - May </Td> </Tr> <Tr> <Td> </Td> <Td> Joishtho (জ্যৈষ্ঠ) </Td> <Td> Grishmo (গ্রীষ্ম) </Td> <Td> 31 </Td> <Td> May - June </Td> </Tr> <Tr> <Td> </Td> <Td> Asharh (আষাঢ়) </Td> <Td> Borsha (বর্ষা) </Td> <Td> 31 </Td> <Td> June - July </Td> </Tr> <Tr> <Td> </Td> <Td> Shrabon (শ্রাবণ) </Td> <Td> Borsha (বর্ষা) </Td> <Td> 31 </Td> <Td> July - August </Td> </Tr> <Tr> <Td> 5 </Td> <Td> Bhadro (ভাদ্র) </Td> <Td> Shorot (শরৎ) </Td> <Td> 31 </Td> <Td> August - September </Td> </Tr> <Tr> <Td> 6 </Td> <Td> Aashin (আশ্বিন) </Td> <Td> Shorot (শরৎ) </Td> <Td> 30 </Td> <Td> September - October </Td> </Tr> <Tr> <Td> 7 </Td> <Td> Kartik (কার্তিক) </Td> <Td> Hemonto (হেমন্ত) </Td> <Td> 30 </Td> <Td> October - November </Td> </Tr> <Tr> <Td> 8 </Td> <Td> Ogrohayon (অগ্রহায়ণ) </Td> <Td> Hemonto (হেমন্ত) </Td> <Td> 30 </Td> <Td> November - December </Td> </Tr> <Tr> <Td> 9 </Td> <Td> Poush (পৌষ) </Td> <Td> Sheet (শীত) </Td> <Td> 30 </Td> <Td> December - January </Td> </Tr> <Tr> <Td> 10 </Td> <Td> Magh (মাঘ) </Td> <Td> Sheet (শীত) </Td> <Td> 30 </Td> <Td> January - February </Td> </Tr> <Tr> <Td> 11 </Td> <Td> Falgun (ফাল্গুন) </Td> <Td> Boshonto (বসন্ত) </Td> <Td> 30 (31 in leap years) </Td> <Td> February - March </Td> </Tr> <Tr> <Td> 12 </Td> <Td> Choitro (চৈত্র) </Td> <Td> Boshonto (বসন্ত) </Td> <Td> 30 </Td> <Td> March - April </Td> </Tr> </Table> <Tr> <Th> No . </Th> <Th> Name </Th> <Th> Bengali season </Th> <Th> Days </Th> <Th> Julian months </Th> </Tr> <Tr> <Td> </Td> <Td> Boishakh (বৈশাখ) </Td> <Td> Grishmo (গ্রীষ্ম) </Td> <Td> 31 </Td> <Td> 14 April - May </Td> </Tr>

How are the number of days in a month determined