timezone-time-from-absolute

timezone-time-from-absolute is a compiled Lisp function in `timezone.el'.

(timezone-time-from-absolute DATE SECONDS)

Compute the UTC time equivalent to DATE at time SECONDS after midnight.
Return a list suitable as an argument to `current-time-zone',
or nil if the date cannot be thus represented.
DATE is the number of days elapsed since the (imaginary)
Gregorian date Sunday, December 31, 1 BC.