A priori I thought 2015 was a perfectly valid ISO8601 date-time specification. It appears that SysTime.fromISOString disagrees:

core.time.TimeException@/usr/include/d/std/datetime.d(8553): Invalid
ISO String: 2015

So am I right or wrong.  https://en.wikipedia.org/wiki/ISO_8601https://en.wikipedia.org/wiki/ISO_8601

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