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Bug description: As the user navigates the datepicker control, the initDate is updated. This causes issues if you use the the current date of one datepicker as the initDate of another.

Also, note how the Start Date control itself doesn't change, but the model value does.

Expected: initDate is essentially readonly.

Link to minimally-working plunker that reproduces the issue:

https://plnkr.co/edit/tvelT5r6ho59zcPzPvIH?p=preview

Steps to reproduce the issue:

As noted in the Plunker, simply navigate forward or backward by month in the End Date datepicker and note how the Start Date value changes.

Version of Angular, UIBS, and Bootstrap

Angular: 1.6.1

UIBS: 2.5.0

Bootstrap: 3.3.7