This fixes a bug where entries could be out of order if they were recorded on machines in different TZs (e.g. if one machine had the TZ set to UTC). Admittedly, this commit isn't a perfect fix since
it doesn't change all the existing hishtory entries to be stored in UTC, but this just means that the ordering bug will continue to exist for historical entries, but be fixed for new entries. And
for our purposes, that is good enough. :)
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