<input name="time_1" type="text" id="time_1" value="" onkeyup="this.value=this.value.replace(/\D/g,'');" onafterpaste="this.value=this.value.replace(/\D/g,'')" onFocus="WdatePicker({skin:'twoer',dateFmt:'yyyy-MM-dd HH:mm:00',maxDate:'#F{$dp.$D(\'time_2\')}',doubleCalendar:true})" readonly="true" class="input length_3" style="width:130px;" /> - 
<input name="time_2" type="text" id="time_2" value="" onkeyup="this.value=this.value.replace(/\D/g,'');" onafterpaste="this.value=this.value.replace(/\D/g,'')" onFocus="WdatePicker({skin:'twoer',dateFmt:'yyyy-MM-dd HH:mm:00',minDate:'#F{$dp.$D(\'time_1\')}',doubleCalendar:true})" readonly="true" class="input length_3" style="width:130px;"/>