On what date were four demos for Metallica's 1991 album Metallica recorded?

Four demos for Metallica's 1991 album Metallica were recorded on August 13, 1990.

The demoed songs were “Enter Sandman,” “The Unforgiven,” “Nothing Else Matters,” and “Wherever I May Roam.” These early recordings captured important ideas before the band began the main album sessions at One on One Recording Studios in October 1990.

The sequence of songwriting contains an interesting contrast. “Enter Sandman” was the first song written for the album but the last to receive its lyrics. The band also recorded a demo of “Sad but True” later, on October 4, 1990.

The demos belong to the writing and development phase, not the album's official release campaign. Metallica itself was released on August 12, 1991, almost a year after these early recordings, following additional tracking, overdubs, and mixing.