How to get all the birthdays of today?

Question

Does anyone know how to make a Linq query that gets all the birthdays of today? The code below doesn\'t work :

var getBirthdays = 
    orgContext.CreateQuery<         


        

Answer 1

Anytime a vendor writes a four part blog series on how to do something as simple as finding a birthday (as Microsoft did in 2007), you have to know this won't be simple. So far as I can tell, this hasn't updated since then.

• Find contacts with upcoming birthdays
• Find contacts with upcoming birthdays - Part 2
• Find contacts with upcoming birthdays - Parts 3 and 4

So you have limited options:

1. Make new fields called something like new_birthmonth and new_birthday that's updated every time a contact is created or updated via a plugin, and then query on those int fields.
2. Using Dynamic Linq, construct an OR clause in your WHERE clause that checks to see if the birthday falls in a reasonable range of years (say, 140 for the long-livers) (code below).

List birthdays = new List(); //will contain list of OR clauses

//makes sure no CRM unsupported dates are passed (less than 1/1/1900)
for (int i = Math.Min(140, DateTime.Today.Year - 1900); i > -1; i--) 
{
    //adds a different date per year
    birthdays.Add
    (
        string.Format
        (
            //DateTimes are stored in UTC
            "BirthDate = DateTime.Parse(\"{0}\")",
            DateTime.Today.ToUniversalTime().AddYears(-i)
        )
    );
}

//completes the correct dynamic linq OR clause
string birthdayList = string.Join(" OR ", birthdays);

var getBirthdays = orgContext.CreateQuery()
    .Where(c => c.BirthDate != null)
    .Where(birthdayList)
    .ToList();