Sometimes incorrect transaction date visible - Jan 1, 1970

[Compunologist]

I recently browsed through some of the accounts just to see if something did not look right: E.g. on this page: https://nanocrawler.cc/explorer/account/nano_1gyoa9ii3bd9kow9wtimxb84ux1cy334ijome5d9dxoapkuwdf5jfo7jzpur/history All the "Send" transactions show a "Date" of "Jan 1, 1970 01:00:00" which obviously can not be right. Jan 1, 1970 is also the UNIX epoch so it would seem something goes wrong with measured time in those fields.
Zach Hyatt (Nano Project Manager) explained that these incorrect dates typically can occur "because timestamps were not included in the Nano node until V18 in February of this year."

When following the "Send" transaction of -0.244629 NANO on "Jan 1, 1970)" by clicking the receiving address it would seem however the transaction date is correct "May 31, 2019":
https://nanocrawler.cc/explorer/account/nano_1uq9fiufa3n9zigei89ec8djfnujqh4hqxk8834q5w5s85yrpz5drn6skmgq/history

Is NanoCrawler not always able to capture the correct timestamp? Is it possible to correct the mentioned "jan 1, 1970" dates or when there is insufficient data display "unknown" instead? (which can also be seen at several pages)

Thanks