test(datetime): add missing declaration
test(datetime): add missing declaration

alan-agius4/ionic,joshesp/ionic,alan-agius4/ionic,alan-agius4/ionic,joshesp/ionic,TillaTheHun0/ionic,driftyco/ionic,joshesp/ionic,driftyco/ionic,alan-agius4/ionic,TillaTheHun0/ionic,driftyco/ionic,driftyco/ionic,TillaTheHun0/ionic,TillaTheHun0/ionic,joshesp/ionic,alan-agius4/ionic,driftyco/ionic,alan-agius4/ionic