Difference between fragmentlastsave and jcr:lastModifed date in content fragment

[Magesh06]

While working on AEM Content Fragments we noticed that there is a new jcr property which is "fragmentlastsave" and trying to figure out the purpose of this property. The value getting stored is same as value stored as part of jcr:lastModifed date. Any can provide the justification for this? 

[Theo_Pendle · Accepted solution]

I couldn't tell you exactly when jcr:lastModified might be used vs lastFragmentSave within AEM's internal logic.

What I can say is that lastFragmentSave is the a timestamp indicating the last time at which original fragment was saved, whereas jcr:lastModified is a more generic timestamp that indicates when the resource as a whole was last modified.

You can see the difference between these two concepts when you create a variation of a fragment:

The original fragment doesn't change so lastFragmentSave isn't updated.

However, the creation of a variation is an update of the resource, so jcr:lastModified is updated

In this screenshot you can see that, in this example,  the two are about a minute a part.

[Magesh06]

I suspected this and created a variation but it's strange that still both the timestamps are getting updated with same value on my instance. I'm using 6.4

[Theo_Pendle]

Well to be honest I'm not sure this is a critically important point, but just for the fun of it: when you create a variation, if you DON'T click on save, it should update only jcr:lastModified