for the private closing time, jens lives in US, so the EST refers to american EST and not to australian one.

so, EST is GMT-5

thus, closing time:
"Private coding ends Saturday, December 30, at 6pm EST"

is 23:00 GMT.
for CET it's 00:00, 31st of december
and for EET it's 01:00, 31st of december
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