tango/time/ISO8601.d unittest failure

[SiegeLord]

Happens with dmd 2.065 but not with LDC v2.063.2:

[email protected](1366): unittest failure
----------------
.unittest/out(_d_unittestm+0x47) [0x427327]
.unittest/out(void tango.time.ISO8601.__unittest_fail(int)+0x1a) [0x4232ea]
.unittest/out(void tango.time.ISO8601.__unittestL913_1()+0x2d8a) [0x420e62]
.unittest/out(void tango.time.ISO8601.__modtest()+0x9) [0x423289]
.unittest/out(int core.runtime.runModuleUnitTests().__foreachbody3(ref object.ModuleInfo*)+0x30) [0x42b4cc]
.unittest/out(int rt.minfo.moduleinfos_apply(scope int delegate(ref object.ModuleInfo*)).__foreachbody2(ref rt.sections_linux.DSO)+0x4c) [0x429168]
.unittest/out(int rt.sections_linux.DSO.opApply(scope int delegate(ref rt.sections_linux.DSO))+0x42) [0x4291de]
.unittest/out(int rt.minfo.moduleinfos_apply(scope int delegate(ref object.ModuleInfo*))+0x25) [0x429101]
.unittest/out(runModuleUnitTests+0xae) [0x42b362]
.unittest/out(void rt.dmain2._d_run_main(int, char**, extern (C) int function(char[][])*).runAll()+0x17) [0x427c67]
.unittest/out(void rt.dmain2._d_run_main(int, char**, extern (C) int function(char[][])*).tryExec(scope void delegate())+0x2a) [0x427c1a]
.unittest/out(_d_run_main+0x1a3) [0x427b9b]
.unittest/out(main+0x17) [0x41d97f]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf5) [0x7f51456c9de5]