Create random dates to use as a Property on Neo4J, considering the maximum amount of days in each month, not taking leap years into account.

random-dates.cypher

// Using this MATCH in the beginning of the query to define the type of node you are referencing will make Neo4J iterate through 
// each of them, avoiding the need to use other methods.

// startYear is the start of the year range, endYear is the end of the year range. Change to your needs as you see fit.

// Variables y and m are the random year and month generated, so you can obtain the days in the next step, that are returned as 
// the variable maxDays in the end of the CASE statement

// With the SET command on line 15, you can either update or create the desired property containing the random date you just created.
 
// The RETURN is optional in case you want to check the created dates.

MATCH (n:LabelOfNode)
WITH n, 1900 as startYear, 2010 AS endYear
WITH n, toInteger(startYear + floor(rand() * (endYear - startYear + 1))) AS y, toInteger(1 + floor(rand() * 12)) AS m
WITH n, y, m,
  CASE
    WHEN m IN [1, 3, 5, 7, 8, 10, 12] THEN 31
    WHEN m IN [4, 6, 9, 11] THEN 30
    WHEN m = 2 THEN 28
  END AS maxDays
SET n.desiredProperty = date({year: y, month: m, day:toInteger(1 + floor(rand() * maxDays))})
RETURN n.desiredProperty;