That's a great question I don't know the answer now. Previously, I've used `DatabaseMysql::timestamp()` which is using [`wfTimestamp()`](https://github.com/Wikia/app/blob/dev/includes/db/Database.php#L2961) with `TS_MW` parameter. We could use `wfTimestamp()` directly with `TS_DB` but it's different than the format you mentioned. There are also other `TS_*` constants we could take a look at later. 

But I can confirm it works on dev and prod -- @moliwikia and me smoke tested it. @wladekb maybe you know the answer on: why core MW database wrapper uses `TS_MW` instead of something similar to the format @themech mentioned? :)