Searx/searx/templates/oscar/time-range.html

<select name="time_range" id="time-range" class="custom-select form-control">
    <option id="time-range-anytime" value="" {{ "selected" if time_range=="" or not time_range  else ""}}>
        {{ _('Anytime') }}
    </option>
    <option id="time-range-day" value="day" {{ "selected" if time_range=="day" else ""}}>
        {{ _('Last day') }}
    </option>
    <option id="time-range-week" value="week" {{ "selected" if time_range=="week" else ""}}>
        {{ _('Last week') }}
    </option>
    <option id="time-range-month" value="month" {{ "selected" if time_range=="month" else ""}}>
        {{ _('Last month') }}
    </option>
    <option id="time-range-year" value="year" {{ "selected" if time_range=="year" else ""}}>
        {{ _('Last year') }}
    </option>
</select>