如何解析在秒内使用不正确位数的时间戳？

Question

Long story short, someone messed up a few months ago, and the Production environment is saving timestamps on certain cases, where the timestamp format as MMM-dd-yy HH:mm:sss'Z' Yes that is 3 digits for the seconds, NOT milliseconds.

How can I get DateTimeFormatter to be able to parse such as a timestamp, as attempting to use that pattern above is not a valid pattern for it to use?

Answer 1

Perhaps just use a regex to preprocess the input date before sending it to the formatter?

The following regex captures all the data except for the extraneous second:

([a-zA-Z]{3})-(\d\d)-(\d\d) (\d\d):(\d\d):\d(\d\d)(.*)

And this replacement string puts it back together:

$1-$2-$3 $4:$5:$6$7