datetimepicker标签解析： Description： Renders a date/time picker in a dropdown(下拉) container.
A stand-alone DateTimePicker widget(文本桌面) that makes it easy to select a date/time, or increment by week, month, and/or year.
It is possible to customize the user-visible formatting with either the 'formatLength' (long, short, medium or full) or 'displayFormat' attributes. By defaulty current locale(区域设置) will be used.
参数displayFormat的所有可能取值：
Format Description d Day of the month D Day of year M Month - Use one or two for the numerical month, three for the abbreviation, or four for the full name, or 5 for the narrow name. y Year h Hour [1-12]. H Hour [0-23]. m Minute. Use one or two for zero padding. s Second. Use one or two for zero padding. The following formats(in order) will be used to parse the values of the attributes 'value', 'startDate' and 'endDate':
SimpleDateFormat built using RFC 3339 (yyyy-MM-dd'T'HH:mm:ss) SimpleDateFormat.getTimeInstance(DateFormat.SHORT) SimpleDateFormat.getDateInstance(DateFormat.SHORT) SimpleDateFormat.getDateInstance(DateFormat.MEDIUM) SimpleDateFormat.getDateInstance(DateFormat.FULL) SimpleDateFormat.getDateInstance(DateFormat.LONG) SimpleDateFormat built using the value of the 'displayFormat' attribute(if any)
