Tranquillity Calendar Converter Tool

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I think the understood conversion is that the "zero date" is January 1 of 1970 (the unix epoch and also the first start-of-year after the Tranquillity landing) being equivalent to Archimedes 1 of the year zero AT? This tool has it as the date of the moon landing, which makes for really awkward conversions I don't think most people would put up with at the changeover.

Not quite. You are correct, it is for synchronisation. So you can basically enter java.util.Date and output it through the Tranquility Calendar.

And then there's weird conventions about leap years.

That of course, is debateable. Just enter any other rule you deem appropriate.