January 18

So TMZ posted this story today and when they originally posted it they had the year as January 18, 2009 and then changed it:

Jackson Investigation Mystery Date

Big clue in the Michael Jackson investigation -- the LAPD detective leading the probe indicated January 18, 2010 may be a significant date.

Detective Orlando Martinez asked a Las Vegas judge this AM to keep search warrant documents related to Applied Pharmacy secret
until January 18. Law enforcement sources told us previously cops
didn't want the warrant made public until the investigation was
completed. As we first reported, the LAPD believes Applied Pharmacy supplied Dr. Conrad Murray
with the Propofol that ultimately killed Michael Jackson. They are on
the hunt to make sure other pharmacies didn't supply Propofol.
http://www.tmz.com/2009/11/18/michael-jackson-dr-conrad-murray-lapd-investigation-applied-pharmacy-search-warrant-las-vegas/

I then came across this article also published today. The date in this article is also January 18 but in 2020.

Michael Jackson death investigation: Police wants records to remain sealed
Posted on Wednesday, November 18, 2009 (EST)
LA Police have asked a Nevada judge to keep records related to a search warrant issued during the course of Michael Jackson death investigation sealed till January 18, 2020.
November 18, 2009, (Sawf News)

- LA Police have asked a Nevada judge to keep records related to a
search warrant issued during the course of Michael Jackson death
investigation sealed till January 18, 2020.

The Police made the request over telephone during a hearing on
Wednesday, November 18, on documents filed by several news organization
asking for the records to be unsealed.

The police had initially wanted records related to the August
11 search of Applied Pharmacy to remain sealed till the completion of
the investigation.

Clark County District Court Judge Valerie Adair said she will
rule in the case on Thursday, after meeting with a Los Angeles County
deputy district attorney.

Dr. Conrad Murray procured the general anesthetic Propofol that
he routinely administered to Michael Jackson from Applied Pharmacy.

Propofol, in combination with other drugs, is believed to have caused Michael Jackson's death on June 25.

Police are trying to identify other pharmacies that may have
supplied Propofol to Dr. Murray who is the focus of a homicide
investigation.

http://www.sawfnews.com/Gossip/61240.aspx

So both articles have typos for the year in this date. TMZ originally had 2009 and sawfnes has 2020 as the year. So the year is
not correct. The significant part is January 18.

I found this audio file.

Artist Sean Banville
Song Michael Jackson - January 18, 2005

It is not a song, it is an audio file about MJ and what he was doing in Bahrain.

http://abmp3.com/download/4449143-michael-jackson-january-18-2005.html