java convert LocalDateTime to long

To convert a java.time.LocalDateTime object to a long value in Java, you can use the toEpochSecond method to get the number of seconds since the epoch (midnight, January 1, 1970 UTC) as a long value, and then use the toEpochMilli method to convert the value to milliseconds.

Here is an example of how you can convert a java.time.LocalDateTime object to a long value in Java:

LocalDateTime localDateTime = LocalDateTime.now();
long epochSeconds = localDateTime.toEpochSecond(ZoneOffset.UTC);
long epochMillis = localDateTime.toEpochMilli();

In this example, we have a LocalDateTime object called localDateTime that represents a specific date and time. We use the toEpochSecond method to get the number of seconds since the epoch as a long value, and assign it to a long variable called epochSeconds. We then use the toEpochMilli method to convert the value to milliseconds, and assign it to a long variable called epochMillis.