<p v-html="prob.instructions"></p>
<p v-if="preview" v-html="prob.solution"></p>
<p v-else class="problem-time">{{ timestamp2date(prob.added) }}</p>
<p v-html="prob.instructions"></p>
<p v-if="preview" v-html="prob.solution"></p>
<p v-else class="problem-time">{{ timestamp2date(prob.added) }}</p>