宜搭中如何获取当月的月天数

{
   
   "text":"IF(OR(EQ(MONTH(NOW()),1),EQ(MONTH(NOW()),3),EQ(MONTH(NOW()),5),EQ(MONTH(NOW()),7),EQ(MONTH(NOW()),8),EQ(MONTH(NOW()),10),EQ(MONTH(NOW()),12)),31,IF(OR(EQ(MONTH(NOW()),2),EQ(MONTH(NOW()),4),EQ(MONTH(NOW()),6),EQ(MONTH(NOW()),8),EQ(MONTH(NOW()),10),),30,IF(AND(EQ(MONTH(NOW()),2),OR(AND(EQ(MOD(YEAR(DATE(TIMESTAMP(NOW()))),4),0),NOT(EQ(MOD(YEAR(DATE(TIMESTAMP(NOW()))),100),0))),EQ(MOD(YEAR(DATE(TIMESTAMP(NOW()))),400),0))),29,28)))","marks":[],"isCmData":true}