Which time is usually used for doing exhumation?

Exhumation is the digging out of an already buried body from the grave. Exhumation is done under the order of appropriate officers, in the presence of a police officer, only in the early morning (in natural light). The body is exhumed only when, there is a written order from the Executive Magistrate. Ref: The Essentials of Forensic Medicine and Toxicology by KS Narayan Reddy, 27th edition, Page 117-118.