[Description] Specifies the start date associated with the query. The date must be entered in the following format: YYYY-MM-DD. [Option] 
Start Date
S t a r t D a t e
E n d D a t e
D i m e n s i o n s
M e t r i c s
F i l t e r s
S o r t
S p e c i f y a s e g m e n t f o r t h e q u e r y
U s e c u s t o m s e g m e n t
U s e p r e d e f i n e d s e g m e n t