How Can I Query an NTP Server for Date and Time Using C#?

Use C#to query the NTP server

This article introduces how to use C#and System.net.sockets to obtain the date and time from the NTP server. The steps are as follows:

<.> 1. Create NTP Message:

Build a 48 -byte NTP message, specify the jump indicator, version number and mode. <.> 2. Create UDP connection:

connected to the 123 port of the NTP server (for example, "time.windows.com").

<.> 3. Send NTP message:

Send the generated NTP message to the NTP server.

<.> 4. Receive NTP response:

Receive the NTP response from the server.

<.> 5. Analysis response:

Extract the "Transmission Time Stamp" field from the response, which indicates the time of the response.

<.> 6. Converted to datetime:

The second and second scores from "Transmission Time Stamp" will be converted to milliseconds since the UNIX Era.

<.> 7. Adjust the time zone:

The UTC time obtained from the NTP server is converted into a local time zone as needed. Through these steps, you can effectively use the C#to query the NTP server and retrieve the date and time as a string or Datetime object.

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