flutter pub add ntp根據套件公開資料產生的選型評估，僅供參考。
ntp 包提供了一種從網路時間協定（NTP）伺服器取得準確系統時間的簡單方式。它讓應用程式能夠取得與全球時間標準同步的精確 DateTime 值，這在日誌記錄、排程或跨裝置同步等對時間敏感的操作中特別有用。該包支援 Android、iOS、macOS、Windows 和 Linux 等多個平台，確保在不同環境中的行為一致。它使用標準 NTP 協定，並提供易於使用的 API 來取得目前時間，而不需依賴本機裝置時鐘。
以下為關聯原始碼儲存庫的 README 原文快照，最新內容請造訪原始碼儲存庫。
Plugin that allows you to get precise time from Network Time Protocol (NTP). It implements whole NTP protocol in dart.
This is useful for time-based events since DateTime.now() returns the time of the device. Users sometimes change their internal clock and using DateTime.now() can give wrong result. You can just get clock offset [NTP.getNtpTime] and apply it manually to DateTime.now() object when needed (just add offset as milliseconds duration), or you can get already formatted [DateTime] object from [NTP.now].
By default lookup address for NTP is: time.google.com
For example on how to use look in github library repository example/ folder.
Using int offset from getNtpTime()
DateTime startDate = new DateTime.now().toLocal();
int offset = await NTP.getNtpOffset(localTime: startDate);
print('NTP DateTime offset align: ${startDate.add(new Duration(milliseconds: offset))}');
Using DateTime from now
DateTime startDate = await NTP.now();
print('NTP DateTime: ${startDate}');
Future<int> getNtpOffset({
String lookUpAddress: 'time.google.com',
int port: 123,
DateTime localTime,
Duration timeout,
});
Future<DateTime> now();