javalib ZipOutputStream does not have Java 8 get/setTime methods.

[LeeTibbert]

javalib ZipOutputStream was implemented before its getTime() and setTime() methods were introduced in Java 8. This means that it does not write Entrys using the UT extension which gives unix-like last-access, created, and last-modified times. The third of those can be found as ms-dos time in the entry.

Lack of these times makes it hard for a putative jdk.zipfs file system to report them.

[LeeTibbert]

Handy/essential reference: A description of the zip Extended Timestamp Extra Field and its contents.