ExifTool

ExifTool knowledge base

Besides the system time of the file modified date, "FileModifyDate", the date/time value stored in the metedata of the file can be "ModifyDate", "DateTimeOriginal" and "CreateDate". Sometimes the"CreateDate" is used for sorting photos in order. (last updated on 9/21/2012)

Command to display all date/time information with the location of information storage is
```
exiftool -time:all -a -G0:1 -s image.jpg
```
Output
```
     [File:System]   FileModifyDate              : 2009:07:31 19:54:07+08:00 
    [EXIF:IFD0]     ModifyDate                  : 2009:07:31 19:54:07 
    [EXIF:ExifIFD]  DateTimeOriginal            : 0000:00:00 00:00:00 
    [EXIF:ExifIFD]  CreateDate                  : 0000:00:00 00:00:00 
    [ICC_Profile:ICC-header]    ProfileDateTime : 1998:02:09 06:49:00            
```
Command to delete all EXIF information in a jpg file is (last updated on 9/21/2012)
```
exiftool -exif:all= image.jpg
```
Command to change "alldates", i.e. "ModifyDate", "DateTimeOriginal" and "CreateDate", with current date/time in a jpg file is (last updated on 9/21/2012)
```
exiftool "-alldates<now" image.jpg
```
Command to change "alldates", i.e. "ModifyDate", "DateTimeOriginal" and "CreateDate", with specific date/time in a jpg file is (last updated on 9/21/2012)
```
exiftool "-alldates='2011:10:13 20:10:30.30+08:00'" image.jpg
```
Command to change the "DateTimeOriginal" and "CreateDate", with specific date/time in a jpg file is (last updated on 9/21/2012)
```
exiftool -DateTimeOriginal="2011:10:13 20:10:30.30+08:00" image.jpg
```