<<Can you guarantee that the time in your digital camera is correct and not some old time (without checking it, just guarantee that it will always be the current date / time)?>>
No, I can't.
<<If not, why do you assume that the time stamp in that image is correct?>>
Big difference between my habits and an army's use of technical equipment. Even my office fax is sometimes out of time, which is really unforgivable. However, these photos are courtesy of the IDF, and I assume that military personnel using military equipment are subject to more rigid protocols in the use of the equipment than I am. For example, I would expect that, just as cops do with breathalyzers, the equipment settings are checked daily at the start of the equipment's working day and by each operator who uses the equipment at the start of his or her first use of it. I would expect a log to be kept for each piece of equipment, with each operator checking off the time of his or her equipment check and also divided up into checkboxes for each aspect of equipment function that the operator checked, to ensure accuracy of time and date and avoid the kind of slipshod settings that could be expected from a schlepper like me. And in armies like the British or Israeli armies, I would expect that such protocols would be rigorously adhered to.