date: add tm initialize
date: add tm initialize

This patch initializes the initial value of the time structure to zero.

Change-Id: I69de592fe0dc9173b908619d8ddc98432f1879da
Signed-off-by: Junhwan Park <7fee488b6f78fc50b291ffc7d10428788977e877@samsung.com>

JunhwanPark/TizenRT,JunhwanPark/TizenRT,JunhwanPark/TizenRT,JunhwanPark/TizenRT,JunhwanPark/TizenRT,JunhwanPark/TizenRT