Dir reports whether any of the sources have been modified more recently than the destination.

DirNewer reports whether any item in sources is newer than the target time.

Glob expands each of the globs (file patterns) into individual sources and then calls Path on the result, reporting if any of the resulting sources have been modified more recently than the destination.

GlobNewer performs glob expansion on each source and passes the results to PathNewer for inspection.

NewestModTime recurses a list of target filesystem objects and finds the the newest ModTime among them.

OldestModTime recurses a list of target filesystem objects and finds the the oldest ModTime among them.

Path first expands environment variables like $FOO or ${FOO}, and then reports if any of the sources have been modified more recently than the destination.

PathNewer checks whether any of the sources are newer than the target time.