Is_in_1month2__c
false
IF(ISBLANK(Contract_recognized_day_1__c) && NOT(ISBLANK(Day_Update__c)), true,
YEAR(Contract_recognized_day_1__c) = YEAR(Evaluation_date__c) && MONTH(Contract_recognized_day_1__c) = MONTH(Evaluation_date__c)
)
BlankAsZero
false
false
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