|Exif TIFF Tag DateTimeDigitized|
TIFF Tag Reference
TIFF Tag DateTimeDigitized
The date and time when the image was stored as digital data.
If, for example, an image was captured by a digital still camera, and at the same time the file was recorded, then the DateTimeOriginal and DateTimeDigitized will have the same contents. The format is "YYYY:MM:DD HH:MM:SS" with time shown in 24-hour format, and the date and time separated by one blank character (hex 20).
When the date and time are unknown, all the character spaces except colons (":") may be filled with blank characters, or else the Interoperability field may be filled with blank characters.
The character string length is 20 bytes including NULL for termination. When the field is left blank, it is treated as unknown.