admin-on-rest using material-ui-datetimepicker as custom input component

MyDateTimeInput.jsx

import React, { Component } from 'react';

import DateTimePicker from 'material-ui-datetimepicker';
import DatePickerDialog from 'material-ui/DatePicker/DatePickerDialog'
import TimePickerDialog from 'material-ui/TimePicker/TimePickerDialog';
import { Field } from 'redux-form';

const renderMyDateTimeInput = ({ input, meta: { touched, error } }) => (

    // for more customisation, see  https://github.com/dmtrKovalenko/material-ui-datetimepicker
    <DateTimePicker
        DatePicker={DatePickerDialog}
        TimePicker={TimePickerDialog}
        errorText={touched && error}
        {...input}
      />
);
const MyDateTimeInput = ({ source }) => <Field name={source} component={renderMyDateTimeInput} />
export default MyDateTimeInput;

then you can use it inside admin-on-rest SimpleForm like this below;

<SimpleForm>
    <MyDateTimeInput source="datetime" />
</SimpleForm>

more docs/info at admin-on-rest