#25422 Breaking Change! Timestamps are now cached as UTC unixtime.
Previously, timestamps were caches as local time zone based unixtime, to
make it easy for clients to just pick up and display a value. However,
this won't work if you travel with your laptop or when daylight savings
time kicks in. This is a change in behaviour and is part of the
versioning up to v2.0 of the whole framework. The cache generation is
also versioned up to ensure that old caches are not interpreted against
this new convention.