C DateTime and timestamp conversion instance

The conversion between C # DateTime and timestamp, including JavaScript timestamp and Unix timestamp.

1. What is a timestamp

First of all, we should know the difference between the timestamps of JavaScript and Unix:

JavaScript timestamp: It refers to the total milliseconds from 00:00: 00 GMT on January 1, 1970 (08: 00: 00 Beijing time on January 1, 1970) to the present.

Unix timestamp: It refers to the total number of seconds from 00:00: 00 GMT on January 1, 1970 (08: 00: 00 Beijing time on January 1, 1970) to the present.

You can see the total number of milliseconds of JavaScript timestamp and the total number of seconds of Unix timestamp.

For example, the same 2016/11/03 12:30, converted to JavaScript timestamp is 1478147400000; Convert to Unix timestamp 1478147400.

2. JavaScript timestamp conversion to each other

2.1 C # DateTime to JavaScript timestamp

System.DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(1970, 1, 1)); //  Local time zone 

long timeStamp = (long)(DateTime.Now - startTime).TotalMilliseconds; //  Difference in milliseconds 

System.Console.WriteLine(timeStamp); 

2.2 JavaScript timestamp is converted to C # DateTime

long jsTimeStamp = 1478169023479;

System.DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(1970, 1, 1)); //  Local time zone 

DateTime dt = startTime.AddMilliseconds(jsTimeStamp);

System.Console.WriteLine(dt.ToString("yyyy/MM/dd HH:mm:ss:ffff")); 

3. Unix timestamp conversion to each other

3.1 C # DateTime to Unix timestamp

System.DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(1970, 1, 1)); //  Local time zone 

long timeStamp = (long)(DateTime.Now - startTime).TotalSeconds; //  Difference in seconds 

System.Console.WriteLine(timeStamp); 

3.2 Unix timestamp is converted to C # DateTime

long unixTimeStamp = 1478162177;

System.DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(1970, 1, 1)); //  Local time zone 

DateTime dt = startTime.AddSeconds(unixTimeStamp);

System.Console.WriteLine(dt.ToString("yyyy/MM/dd HH:mm:ss:ffff"));