12月21日

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错误：时间无效。

In the southern hemisphere on Earth, 12月21日 was also known as Midsummer's Eve. (PROSE: Iceberg) In the northern hemisphere, it was instead the winter solstice. While John Lennon was convinced that the date was also Aztec sun god Huitzilopochtli's birthday, the Seventh Doctor dismissed him as "getting [his] mythologies meddled". (PROSE: The Left-Handed Hummingbird)

In 2010, it was also the date of an unknown Torchwood Three operation. The date was in both Captain Jack Harkness' and Gwen Cooper's CIA files, detailing the figures of a "case" numbered "00938478766-04". (TV: The New World)