"startDate" attribute is not longer included in the "build" node

[onuralp]

It is not possible to get buildDate from build node element. So application doesn't work with teamcity 8.1

http://confluence.jetbrains.com/display/TCD8/Upgrade+Notes

In the lists of builds, "startDate" attribute is not longer included in the "build" node. It has become an element instead of attribute to match the full build data representation. If your REST API usage is affected, check a way to get that element in a request for the list of builds.