Fix date format in the DateTimeHelper

There is an issue where the date doesn't format properly when using the RAW_RFC_3309 format. It needs to be changed from uuuu-MM-dd'T'HH:mm:ssXXX to yyyy-MM-dd'T'HH:mm:ssXXX

added Bug priorityhigh statewip team:webdev labels

assigned to @zacharysabourin

mentioned in commit zacharysabourin/eclipsefdn-api-common@2deb8d1c

mentioned in merge request !79 (merged)

added statereview label and removed statewip label

closed with commit 2deb8d1c

closed with merge request !79 (merged)