Created
March 6, 2014 05:23
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The undocumented behavior of ALAssetPropertyDate
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| /* | |
| * In practice, what I've found is that ALAssetPropertyDate, which is documented as the "asset creation time" | |
| * will return (always in UTC): | |
| * | |
| * (1) If taken from the native camera, a ms-precision time of when the photo was taken. | |
| * (2) If EXIF exists, EXIF time converted to UTC based on the timezone the device was in when | |
| * the photo was saved to the camera roll. This is sec-precision. | |
| * (3) If EXIF does not exist, the time the photo was written into the camera roll. This is sec-precision. | |
| */ | |
| NSDate *timeTaken = [asset valueForProperty:ALAssetPropertyDate]; |
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From this article, I found three types of date time in EXIF, so I am wondering which exif time convert to ALAssetPropertyDate? I can't make it out because I don't have a photo that has three different date time.