Github user Peilin-Yang commented on the issue:
https://github.com/apache/zeppelin/pull/1500
@felizbear
The code of this PR uses `momentjs` to parse the string to date.
Specifically, http://momentjs.com/docs/#/parsing/string/
Integers are not of ISO8601 format so javascript's native method `Date` is
called to parse the string.
More details can be found at
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/parse
In your example, integer strings smaller than 13 are parsed as `nn/01/2001`
and `44` is parsed as `01/01/2044`.
To be honest I am also confusing why `23` and `24` are not parsed but it is
definitely related to how `Date` parses them.
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