timestamps before 1980

[Andrew]

ZIP does not support timestamps before 1980. So the case of plenty issues, for instance, it's already happened here mishoo/UglifyJS#2054

$ ll ./node_modules/cacache

total 216
-rw-r--r--  1 watashi  staff    17K Jan  1  1970 CHANGELOG.md
-rw-r--r--  1 watashi  staff   755B Jan  1  1970 LICENSE.md
-rw-r--r--  1 watashi  staff    20K Jan  1  1970 README.es.md
-rw-r--r--  1 watashi  staff    20K Jan  1  1970 README.md
-rw-r--r--  1 watashi  staff    58B Jan  1  1970 en.js
-rw-r--r--  1 watashi  staff    58B Jan  1  1970 es.js
-rw-r--r--  1 watashi  staff   5.3K Jan  1  1970 get.js
-rw-r--r--  1 watashi  staff    58B Jan  1  1970 index.js
drwxr-xr-x  7 watashi  staff   224B Mar  2 20:05 lib
drwxr-xr-x  6 watashi  staff   192B Mar  2 20:05 locales
-rw-r--r--  1 watashi  staff   121B Jan  1  1970 ls.js
drwxr-xr-x  4 watashi  staff   128B Mar  3 12:37 node_modules
-rw-r--r--  1 watashi  staff   2.4K Jan  1  1970 package.json
-rw-r--r--  1 watashi  staff   1.7K Jan  1  1970 put.js
-rw-r--r--  1 watashi  staff   661B Jan  1  1970 rm.js
-rw-r--r--  1 watashi  staff    55B Jan  1  1970 verify.js

[Kat Marchán]

npm has been updated to set a timestamp in 1985, and recent releases of cacache use this.

[Vladimir Starkov]

@zkat why does npm need to set timestamp in the past?