Trying to set a data type property with the value: 2020-09-15 03:42:20 -0500
Gives the warning:

"2020-09-15 03:42:20 -0500" contains more than three components required for a date interpretation.
The data comes from a script I am using to document git log entries
git --no-pager log --reverse --pretty=format:{{commit'|'host=$host'|'path=${path}'|'project=${project}'|'subject=%s'|'name=%cn'|'date=%ci'|'hash=%h'|'storemode=subobject'|'viewmode=line}}
So it would be great not to have to modify the script to work around the negative timezone not being handled.
The MW and SMW versions are somewhat old. What happens using more current versions?
MW 1.35.0 + SMW 3.2.0 does not have the problem
Let's put it like this: Appears to work on sandbox