Elon Musk has picked a day for X to move out of San Francisco, and it is a day that his superstitious employees will appreciate. //

In leaving San Francisco in his dust, Elon Musk is throwing superstition to the winds.

Employees of San Francisco-based X were told in a memo sent around on Thursday that the date has been set for leaving their offices, according to Fortune, which based its account on a source it did not name.

The date is Sept. 13, which this year arrives on a Friday.