Grails default timezone nature while building API - mysql

Question

I am using grails 2.4.4 for building a restful API. I am having a lot of trouble figuring out grails default time-zone settings.
The premise of the problem is I am using default grails setting without using and dateBinders in config.groovy and the timezone of my both mysql and application server is in NPT.
So I am posting a json something like
{"clusterStartTime":"2015-10-15T17:45:00Z"}
Now this is a ISO 8601 format. So how can this date format represent my timezone so grails can interpret it ??
In database it is being saved as 2015-10-15 17:45:00.
But when I get this resource I am getting :
{"clusterStartTime": "2015-10-15T12:00:00Z"}
So I am getting a time with offset of 5:45 which is NPT offset. So how is grails doing all of this ??
So in production I have a server in NPT timezone so how can I save all my dates in UTC timezone and spit out dates in UTC timezone using grails only without setting Java enviroment variables ??

Answer 1

In your bootstrap.groovy set the timezone like this:
TimeZone.setDefault(TimeZone.getTimeZone("Asia/Katmandu"))
NTP is not supported directly. To get a list of supported timezones see the output of TimeZone.getAvailableIDs().
In order to interpret correctly any ISO 8601 date you have to use a good parser. The one provided by javax.xml.bind.DatatypeConverter should be good enough. The method parseDateTime expects a lexicalXSDDateTime, which must be ISO 6801 compliant.
Therefore try this:
def cal = javax.xml.bind.DatatypeConverter.parseDateTime('2015-10-15T17:45:00Z')
def d = cal.getTime()
def t1 = new TestClass(myDate: d).save(failOnError:true)
println t1.myDate //Thu Oct 15 17:45:00 NPT 2015
The date gets saved on the database (e.g. in a DATETIME field) considering the time zone you defined, so it should be correct when you retrieve it.