The amount of precision to represent with substrings of "ymdhms", as "y"ear, "m"onth, "d"ay, "h"our, "m"inute, and "s"econd. (e.g. "ymdhm" would show precision through minutes. When NULL, max_precision is returned. When precision is more precise than max_precision, a warning is given and max_precision is returned.

The maximum precision allowed to be output.

Include the timezone in the output format