修复时间格式化方法毫秒值展示异常的问题
修复时间格式化方法毫秒值展示异常的问题

date_format中nn为分钟S为毫秒值
/// Outputs millisecond compactly
///
/// Example:
///     formatDate(DateTime(1989, 02, 1, 15, 40, 10, 999), [SSS]);
///     // => 999
///     formatDate(DateTime(1989, 02, 1, 15, 40, 10, 99), [SS]);
///     // => 99
///     formatDate(DateTime(1989, 02, 1, 15, 40, 10, 9), [SS]);
///     // => 9
const String S = 'S';
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