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For what it's worth, I also put the update on to the eTrex using a Windows 10 computer.

Yesterday Garmin announced that they have developed new firmware for the eTrex Venture HC (and certain other handhelds of the same era). The new firmware is v 3.80, and having installed it I can confirm that the date displayed is now correct. Regrettably there may be some DeLorme products for which no fix has yet been found, but I'm encouraged that Garmin did actually respond to the issue affecting some eTrex items.

Despite these reassurances, I was glad to get a response from Garmin yesterday. They have a fix for the incorrect date on the eTrex Venture HC. The link to the new firmware is https://support.garmin.com/en-US/?faq=qpVUfZBKI28PqnPd6HuXa6 Their email indicated that this was also applicable to the Summit HC, Legend H and Vista H. There are some slightly inconvenient caveats about which Windows OS can be used to install the new firmware, but I can live with those. As we are only three weeks away from the next rollover, it will be fingers crossed for a while.

This problem first arose in October 2018, when the GPS week number hit 1000. Pure guesswork on my part, but I think that the unit software will not handle a week number with greater than 3 decimal digits. In April 2019 the GPS week number will roll over from 1023 to 0, but I don't know what date will be displayed after this rollover. I reported the issue to Garmin in November 2018, and they replied that they were working on a fix. I contacted Garmin again in January 2019, they said they were still working on it and had no forecast for when they would have a solution. As well as the etrex Venture HC which has this bug, I have an even older etrex Venture (green body, monochrome screen) that doesn't have the problem.

It's not just DeLorme items that are affected. I have a Garmin Etrex Venture HC, and this started to show an incorrect date a couple of weeks ago. I phoned Garmin, they told me I wasn't the first to report this trouble recently, and they were working on a solution. The issue is clearly related to the week number in the GPS data. 21st October 2018 was exactly 7000 days (1000 weeks) after the last week number rollover on 21st/22nd August 1999. Thus it looks like the unit software cannot handle GPS data week numbers larger than 3 decimal digits. Given this problem, I suppose there is little chance of the device dealing gracefully with the week number rollover coming on 6th/7th April 2019. I remember back in August 1999 I had a Garmin 'handheld' GPS, and to cope with the rollover it required a hard hard reset, then a considerable period to gather data until it was working again. Anxious moments...