=IF (month (B2)* 100+ day (B2) < month(today())* 100+day(today())，""，if (datedif (today()，date (year (today())，month (B2)，day (B2))，" m") = 2。 ,""))
Last month's reminder:
=IF (month (B2)* 100+ day (B2) < Month (today ()) * 100+ day (today ()), ",if (datedif (), date (year (today ()), month (B2), day (B2))," m") = 6544. ，IF(DATEDIF(TODAY()，DATE(YEAR(TODAY())，MONTH(B2)，DAY(B2))，" m")=0，DAY(B2)& amp； "You have to pay before the date!" ,"")))
This meeting will be correct.