You can't by date; repo init doesn't support date based points.
From git://android.git.kernel.org/tools/repoI was referring "incorrectly" to above as tags for whole source !!.
* [new tag] v1.0 -> v1.0
* [new tag] v1.0.1 -> v1.0.1
* [new tag] v1.0.2 -> v1.0.2
* [new tag] v1.0.3 -> v1.0.3
* [new tag] v1.0.4 -> v1.0.4
* [new tag] v1.0.5 -> v1.0.5
* [new tag] v1.0.6 -> v1.0.6
* [new tag] v1.0.7 -> v1.0.7
* [new tag] v1.0.8 -> v1.0.8
* [new tag] v1.0.9 -> v1.0.9
* [new tag] v1.1 -> v1.1
* [new tag] v1.2 -> v1.2
* [new tag] v1.3 -> v1.3
* [new tag] v1.3.1 -> v1.3.1
* [new tag] v1.3.2 -> v1.3.2
* [new tag] v1.4 -> v1.4
* [new tag] v1.4.1 -> v1.4.1
* [new tag] v1.4.2 -> v1.4.2
* [new tag] v1.4.3 -> v1.4.3
* [new tag] v1.4.4 -> v1.4.4