fixed DateTimeWidget to generate a value according to json schema date-time format

src/themes/bootstrap3/DateTimeWidget.js

@@ -1,8 +1,94 @@
 import React from "react";
-import BaseInputWidget from "./BaseInputWidget";
+import PropTypes from "prop-types";
+import classNames from "classnames";
+import { Field } from "redux-form";
 
+const renderInput = field => {
+  const className = classNames([
+    "form-group",
+    { "has-error": field.meta.touched && field.meta.error }
+  ]);
+  return (
+    <div className={className}>
+      <label className="control-label" htmlFor={field.id}>
+        {field.label}
+      </label>
+      <input
+        {...field.input}
+        type="datetime-local"
+        step="1"
+        required={field.required}
+        className="form-control"
+        placeholder={field.placeholder}
+      />
+      {field.meta.touched &&
+        field.meta.error && (
+          <span className="help-block">{field.meta.error}</span>
+        )}
+      {field.description && (
+        <span className="help-block">{field.description}</span>
+      )}
+    </div>
+  );
+};
+
+const inputFormatLength = "YYYY-MM-DDTHH:mm:ss".length; 
+
+const pad = (n) => {
+  return n < 10 ? '0' + n : n;
+}
+
+const timeZoneOffset = () =>{
+  const now = new Date();
+  const tz = now.getTimezoneOffset();
+  const sign = tz > 0 ? "-" : "+";
+  const hours = pad(Math.floor(Math.abs(tz) / 60));
+  const minutes = pad(Math.abs(tz) % 60);
+
+  return `${sign}${hours}:${minutes}`;
+}
+
+const toDateTimeFormat = (datetime) => {
+  //only change when fully entered
+  if(datetime.length < inputFormatLength){
+    return datetime;
+  }
+  return `${datetime}${timeZoneOffset()}`;
+}
+
+
+const toInputFormat = (datetime) => {
+  if (!datetime) {
+    return "";
+  }
+  //
+  if (datetime.length > inputFormatLength) {
+    return datetime.substring(0, inputFormatLength);
+  }
+  return datetime;
+}
 const DateTimeWidget = props => {
-  return <BaseInputWidget type="datetime-local" {...props} />;
+  return (
+    <Field
+      component={renderInput}
+      label={props.label}
+      name={props.fieldName}
+      required={props.required}
+      id={"field-" + props.fieldName}
+      placeholder={props.schema.default}
+      description={props.schema.description}
+      normalize={toDateTimeFormat}
+      format={toInputFormat}
+    />
+  );
+};
+
+DateTimeWidget.propTypes = {
+  schema: PropTypes.object.isRequired,
+  required: PropTypes.bool,
+  fieldName: PropTypes.string,
+  label: PropTypes.string,
+  normalizer: PropTypes.func
 };
 
 export default DateTimeWidget;