how to set post time for add message

Hi Sean,

The dates used with the REST API are always in ISO 8601 format, but that shouldn't matter much when it comes to displaying the date since your users will (likely) never see the actual results of the REST API.

If you're using the Lithium UI, you can adjust the date format via the Community Admin by browsing to System > Date and Time.

If you're creating your own UI elements for the REST API results (ie. a custom component in the community, or an external widget on your .com website), you can get a friendlier version of the date by using the restapi.response_style parameter. Here are some details about that from the REST API JavaDocs:

If a request specifies the parameter restapi.response_style with the value view, the response will include attributes that relate the elements to the standard web interface. The attributes include

If view_date and view_time don't work for your needs, FreeMarker also provides some date formatting methods which you could use to convert the date into your desired format: 

http://freemarker.sourceforge.net/docs/ref_builtins_string.html#ref_builtin_string_date

http://freemarker.sourceforge.net/docs/ref_builtins_date.html

Here's a similar topic with some examples that may be helpful for you:

http://lithosphere.lithium.com/t5/developers-discussion/How-to-format-date-time-output-nicely/m-p/43600/highlight/true#M1190

Hi AdamN,

view date is no problem. I use the REST API insert record,.

example:
community.domain.com/restapi/vc/boards/id/boardid/messages/post?
message.subject=Title&message.body=Hello Admin&message.post_time=2013-04-20

OR

community.domain.com/restapi/vc/boards/id/boardid/messages/post?
message.subject=Title&message.body=Hello Admin&message.post_time=2013-04-20 05:10

i want to save the date "2013-04-20" or "2013-04-20 05:10", how to do?

I don't think there's a parameter named "message.post_time" for that particular method. There is a "message.post_date" parameter listed in the documentation; however, I believe that particular parameter is reserved for internal Lithium use only. I'm going to follow up on getting the documentation updated to reflect this.

So unfortunately, I don't believe you're going to be able to set a specific time when posting a message. Is there a reason you want to set the time differently than the present time? Perhaps there's some other way to approach what you're trying to accomplish.