Создайте MuiTheme и переопределите свойство backgroundColor часов MuiPickersClock-clock. После этого оберните ваш компонент с ThemeProvider:
import React from "react";
import { KeyboardDateTimePicker, MuiPickersUtilsProvider } from "@material-ui/pickers";
import DateFnsUtils from "@date-io/date-fns";
import { createMuiTheme } from '@material-ui/core/styles';
import { ThemeProvider } from '@material-ui/styles';
const theme = createMuiTheme({
overrides: {
MuiPickersClock: {
clock: {
backgroundColor: 'red'
}
}
}
});
const StaticTimePicker = () => {
return (
<ThemeProvider theme={theme}>
<MuiPickersUtilsProvider utils={DateFnsUtils} >
<KeyboardDateTimePicker
label="Keyboard with error handler"
onError={console.log}
minDate={new Date("2018-01-01T00:00")}
format="yyyy/MM/dd hh:mm a"
/>
</MuiPickersUtilsProvider>
</ThemeProvider>
);
};
export default StaticTimePicker;