DateFormat.getDateTimeInstance() is very expensive, we can cache it to improve 
performance
------------------------------------------------------------------------------------------

                 Key: OFBIZ-4201
                 URL: https://issues.apache.org/jira/browse/OFBIZ-4201
             Project: OFBiz
          Issue Type: Improvement
          Components: framework
    Affects Versions: Release Branch 10.04
            Reporter: Xiaoming Shi


In the files:

./apache-ofbiz-10.04/framework/base/src/org/ofbiz/base/util/UtilDateTime.java 
line:702
./apache-ofbiz-10.04/framework/base/src/org/ofbiz/base/util/UtilFormatOut.java 
line:314

DateFormat.getDateTimeInstance() is called for every function call of 
"toGmtTimestampString" or "formatDate". We can cache the value by adding a 
static class field and improve performance.

This is similar to the Apache Bug 
https://issues.apache.org/bugzilla/show_bug.cgi?id=48778




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