How can I show greetings like Good Moring, afternoon or evening base on users time in flutter

Try using DateTime.now(), for example:

String greeting() {  var hour = DateTime.now().hour;  if (hour < 12) {    return 'Morning';  }  if (hour < 17) {    return 'Afternoon';  }  return 'Evening';}

Fetch the current time and Parse it and fetch only hours.

var timeNow = DateTime.now().hour;

Now, our timeNow a variable has the hour value in integer format we only need to check the condition and Change messages according to time like this

String greetingMessage(){  var timeNow = DateTime.now().hour;    if (timeNow <= 12) {    return 'Good Morning';  } else if ((timeNow > 12) && (timeNow <= 16)) {  return 'Good Afternoon';  } else if ((timeNow > 16) && (timeNow < 20)) {  return 'Good Evening';  } else {  return 'Good Night';  }}

And use as

String greetingMes = greetingMessage();

TimeOfDay.now().period; // This will return DayPeriod.am or DayPeriod.pm, you can show the greeting message accordingly

Link: https://api.flutter.dev/flutter/material/TimeOfDay/period.html

import 'package:flutter/material.dart';void main(){  TimeOfDay day = TimeOfDay.now();  switch(day.period){    case DayPeriod.am: print('its morning');      break;    case DayPeriod.pm: print('its evening/night');  }}