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[Mega]

@pitaj said:

Is there something like this?

Yep, action:user.set
https://github.com/NodeBB/NodeBB/wiki/Plugin-Hooks#actionusersetobject
You could

if ('birthday' === data.field) Meow();

BTW, what do you use to display localized date strings?

https://github.com/NodeBB/NodeBB/blob/private-groups/public/src/translator.js#L88

[PitaJ]

@Mega is the translator used? I thought moment.js was used for it. I could be wrong.

[Mega]

@pitaj said:

@Mega is the translator used?

Yup, a little bit https://github.com/NodeBB/NodeBB/blob/master/public/src/translator.js#L73

[Mega]

@pitaj said:

to display localized date strings

Sorry, I've noticed it just now >.<

Okay, AFAIK, you always, on any page, can do

$('span.timeago').timeago()

And all spans will be translated in appropriate language, BUT
I guess, you actually don't even have to do this! (unless you won't load some content dynamically, not via ajaxify.go())

Because behind of every click on a link, there sits ajaxify.go() that, after each page loading, casts app.processPage() that already includes $('span.timeago').timeago()

[PitaJ]

@Mega but I don't want time ago, I want to display something like

January 1, 2016 11:00am

[Mega]

@pitaj said:

I want to display something like

OMG! I finally got it!

Okay, in NodeBB I've never seen that kind of strings
But you could just use moment, you know, it's fairly straightforward in use.
As I know there is only one thing you need take care over and above moment's documentation - transform locales' name format from NodeBB-like to moment-like
Just like @julian made it here https://github.com/NodeBB/NodeBB/blob/master/public/src/translator.js#L42-L71