<field name="mycalendar" type="calendar" default="2017-05-15" label="Select a date" description=""
    class="input-medium" required="true" filter="user_utc" format="%Y-%m-%d %H:%M:%S"
    singleheader="true" showtime="true" timeformat="12" todaybutton="true" weeknumbers="true"
    filltable="true" minyear="-3" maxyear="5" />

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