Can not import yang modul with explicit revision date: 1970-01-01

The default yang module revision date is initialized as new Date(0); The returned date is dependent on current time zone and so default yang module revision is initialized now in SR as "Thu Jan 01 01:00:00 CET 1970" which is one hour after the imported yang module revision date "1970-01-01" and then imported yang module can not be resolved. Crucial is the line 322 in YangParserBaseListener.java.

Parsing of following yang models:

module foo {
prefix foo;
namespace "namespace-foo";

import import-module

{ prefix imp; revision-date 1970-01-01; }

}

module import-module {
prefix imp;
namespace "import-module";

revision 1970-01-01

{ description "Initial revision."; }

}

produce the following exception:

Exception in thread "main" org.opendaylight.yangtools.yang.parser.util.YangValidationException: Not existing module imported:import-module:1970-01-01 by:foo:default
at org.opendaylight.yangtools.yang.parser.util.ModuleDependencySort.ex(ModuleDependencySort.java:267)
at org.opendaylight.yangtools.yang.parser.util.ModuleDependencySort.getModuleByNameAndRevision(ModuleDependencySort.java:257)
at org.opendaylight.yangtools.yang.parser.util.ModuleDependencySort.processDependencies(ModuleDependencySort.java:217)
at org.opendaylight.yangtools.yang.parser.util.ModuleDependencySort.createModuleGraph(ModuleDependencySort.java:148)
at org.opendaylight.yangtools.yang.parser.util.ModuleDependencySort.sortInternal(ModuleDependencySort.java:131)
at org.opendaylight.yangtools.yang.parser.util.ModuleDependencySort.sort(ModuleDependencySort.java:90)
at org.opendaylight.yangtools.yang.parser.impl.YangParserImpl.parseYangModelSources(YangParserImpl.java:356)
at org.opendaylight.yangtools.yang.parser.impl.YangParserImpl.parseYangModelsMapped(YangParserImpl.java:282)
at org.opendaylight.yangtools.yang.parser.impl.YangParserImpl.parseFiles(YangParserImpl.java:159)