Flutter中如何将DateTime列表转换为带AM/PM的时间格式

To convert your List<DateTime> into the desired 12-hour format with AM/PM indicator, you can use Dart's intl package for reliable date/time formatting.

Step 1: Add the intl Dependency #

First, include the intl package in your pubspec.yaml:

dependencies:
  intl: ^0.18.1 # Use the latest version available on pub.dev

Step 2: Format the DateTime List #

Use DateFormat with the pattern h:mm a to transform each entry in your list. This pattern gives you 12-hour hour values, two-digit minutes, and the AM/PM marker:

import 'package:intl/intl.dart';

void main() {
  List<DateTime> listOfDateTime = [
    DateTime(2022, 10, 10, 14, 30, 45),
    DateTime(2022, 10, 10, 17, 30, 45),
    DateTime(2022, 10, 10, 18, 0, 45),
    DateTime(2022, 10, 10, 18, 30, 45),
    DateTime(2022, 10, 10, 19, 30, 45),
    DateTime(2022, 10, 10, 22, 0, 45),
    DateTime(2022, 10, 12, 17, 0, 55),
    DateTime(2022, 10, 14, 17, 0, 55),
    DateTime(2022, 10, 10, 14, 0, 45),
  ];

  // Initialize the time formatter
  final timeFormatter = DateFormat('h:mm a');

  // Convert each DateTime to the target format
  List<String> formattedTimes = listOfDateTime.map(timeFormatter.format).toList();

  // Print the result
  print(formattedTimes);
}

Pattern Breakdown: #

• h: 12-hour format (1-12, no leading zero)
• mm: Two-digit minutes (00-59)
• a: Uppercase AM/PM indicator

If you want leading zeros for hours (e.g., 02:30 PM instead of 2:30 PM), use the pattern hh:mm a instead.

Expected Output: #

[2:30 PM, 5:30 PM, 6:00 PM, 6:30 PM, 7:30 PM, 10:00 PM, 5:00 PM, 5:00 PM, 2:00 PM]

内容的提问来源于stack exchange，提问作者Ashu Upadhyay