EXIF tag DateTimeDigitized not always present

[MMN-o]

Shooting images with my Nokia N900 will only fill in EXIF data for "DateTimeOriginal", not the tag "DateTimeDigitized" which Wordpress solely uses.

Grabbing data from DateTime and/or DateTimeOriginal would increase the amounts of correct EXIF date data collected when uploading images.

Attaching sample original image from my camera. CLI tool 'exif' when grep:ed with 'Date' outputs the following for the attached image:

Date and Time       |2010:06:25 15:47:14
Date and Time (origi|2010:06:25 15:47:14

'exif --list-tags *jpg|grep Date' results in the following (* meaning data exists):

  0x0132 Date and Time                   *      -      -      -      -   
  0x9003 Date and Time (original)        -      -      *      -      -   
  0x9004 Date and Time (digitized)       -      -      -      -      -  

wp-admin/includes/image.php has the function which retrieves this metadata.

File not attached, but linked here:
​http://ccou.se/files/2010/06/20100625_015.jpg