How to Convert Between Unix Timestamps and DateTime Objects in .NET and Java?

<.> In the .NET and Java to convert unix timestamps and datetime objects

In .NET or Java, it is often necessary to convert between the UNIX timestamp (the number of seconds or milliseconds since the Era) and the DateTime object.

Convert the UNIX timestamp to datetime

In .NET, use the following code to convert UNIX timestamp (in seconds) to dates:

In Java, the timestamp is in milliseconds, and this code is used:

public static DateTime UnixTimeStampToDateTime(double unixTimeStamp)
{
    // Unix时间戳是自纪元以来的秒数
    DateTime dateTime = new DateTime(1970, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc);
    dateTime = dateTime.AddSeconds(unixTimeStamp).ToLocalTime();
    return dateTime;
}

Convert datetime to unix timestamp

// Java代码示例，此处应使用Java的日期时间类，而非.NET的DateTime
public static java.time.LocalDateTime JavaTimeStampToDateTime(long javaTimeStamp) {
    return java.time.Instant.ofEpochMilli(javaTimeStamp).atZone(java.time.ZoneId.systemDefault()).toLocalDateTime();
}

To convert DateTime into UNIX timestamps, just reverse the process:

Please note that the Java example uses the class in the

package provided by the Java 8 and above versions, which provides a more modern and robust date and time processing method than the old

public double DateTimeToUnixTimeStamp(DateTime dateTime)
{
    DateTime epoch = new DateTime(1970, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc);
    TimeSpan span = dateTime.ToUniversalTime() - epoch;
    return span.TotalSeconds;
}

. The .NET example remains unchanged because the code fragment itself has used the Datetime class of the .NET.

// Java代码示例
public static long DateTimeToJavaTimeStamp(java.time.LocalDateTime dateTime) {
    return dateTime.atZone(java.time.ZoneId.systemDefault()).toInstant().toEpochMilli();
}

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