Fix bug: use right format for date when pushing to DB
Fix bug: use right format for date when pushing to DB

JIRA: FUNCTEST-303

Change-Id: I53e7c8f963ef0fa248d76e0d1c5f04326a750dcc
Signed-off-by: Morgan Richomme <863ecccd07b4194c40ddc432b982c8c67e56599a@orange.com>

opnfv/functest,mywulin/functest,opnfv/functest,mywulin/functest