The answer to this question would be: False
Forensic pathologists and anthropologists mostly will give a range of predicted time of death. This time was determined by a combination of multiple death signs like rigor mortis, livor mortis, the temperature or larvae that found.
The time will not precise as all the method can be influenced by many factors like temperature. The high temperature will increase any chemical reaction and lower temperature will slow it. The sign also becomes be less informative if the body found longer.