Hmm, do we have a source for the assertion that the lost hours happened on the Day of Ragnarok rather than the death of Etro? Because in-game sources (i.e. Hope's explanation, and the Datalog) reliably refer to it as having occurred "when the Chaos flooded the world", which while a touch ambiguous (emergence of Unseen Chaos vs full merger with Valhalla), some of Hope's other explanations on the Ark (such as "About the savior") strongly imply this to refer to the latter.

Perhaps there were 12-hour clocks in XIII-2 and I've just forgotten about them... I'm certainly somewhat sceptical of trusting Siliconera's accuracy on details anyway, and their article doesn't itself give a direct source to back up the statement -- Sorceror Nobody Flan 13:34, March 13, 2014 (UTC)

Mog's Clock and Oerba's Schoolhouse clock (I think, this clock is awfully low res) in XIII-2 shows twelve hours while the clocks in XIII's Nautilus and Oerba's Schoolhouse clock 13.—Kaimi (999,999 CP/5 TP) ∙ 13:40, March 13, 2014 (UTC)
Day of Ragnarok is correct. It's explained in the FFXIII-2 Ultimania somewhere or somesuch.Keltainentoukokuu (talk) 16:46, March 13, 2014 (UTC)