isDeliver__c
    false
    IF(ISNULL(Deliver_date__c ) , 0 , 
IF(MONTH(Deliver_date__c) +1 < 10, 
IF(BEGINS(Name, TEXT(YEAR(Deliver_date__c)) & '0' & TEXT(MONTH(Deliver_date__c) +1)) , 1, 0), 
IF(BEGINS(Name, TEXT(YEAR(Deliver_date__c)) & TEXT(MONTH(Deliver_date__c) +1) ) , 1, 0) ) 
)
    BlankAsZero
    
    18
    false
    0
    false
    Number
    false