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The answer was simply to add :md-model-type="String"
to the DatePicker as described on the bottom of the docs (https://vuematerial.io/components/datepicker/):
<div class="date-picker">
<md-datepicker v-model="monthStart" md-immediately :md-model-type="String">
<label>From</label>
</md-datepicker>
</div>
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Source:stackexchange.com