row_event converts timestamps to UTC

[shlomi-noach]

Continued discussion on #161

This explicitly sets UTC for timestamps read by the go-mysql library.
Unfortunately when returning timestamp, it is returned as a string, just so that it is able to support 0000-00-00 00:00:00.
But then it uses the local machine's timezone, converting a real time into string, losing context. Because this is a string, it is not converted back to number when applied as DML event.
This is an attempt to fix that, with local tests already proving well.

cc @dveeden

• contributed code is using same conventions as original code
• code is formatted via gofmt (please avoid goimports)
• code is built via ./build.sh
• code is tested via ./test.sh

[dveeden]

Ran a test and it looks ok. 👍

[siddontang]

@shlomi-noach

Do I need to fix it in go-mysql?

[shlomi-noach]

@siddontang I'm not sure what the correct behavior is in general.

The thing is you have to convert the TIMESTAMP to string so as to support 0000-00-00 00:00:00, but then you lose the context of your time zone.

My take was to turn my app to UTC completely, and let MySQL figure out the timezone differences and do the math.

I think it would be at least nice to have this configurable: do I want to read timestamps in local timezone or in UTC.

[siddontang]

Got it, thanks @shlomi-noach