"against the day"

Anyone have knowledge of the origin of the phrase, "against the day" which of course makes sensein context but seems an odd usage nontheless. This is the title of the new Thomas Pynchon novel and I have seen it used in other novels and am curious because it appears to have a life of its own.

The phrase was used in A Funeral Elegy for Master William Peter by Shakespear . (shakespeareauthorship.com/ elegy.html)

375 But O far be it, our unholy lips
Should so profane the deity above
As thereby to ordain revenging whips
Against the day of Judgment and of Love.

Pamela