localDateTime

LocalDateTime是Java 8中的一个类，用于表示日期和时间的对象。它是LocalDate和LocalTime的组合，可以同时表示年月日和时分秒。 我们可以使用of()方法来创建LocalDateTime对象，在指定时间的时候不需要进行计算，直接传入年、月、日、时、分、秒的值即可。例如，可以使用LocalDateTime.of(2020,4,5,14,59,59)来创建一个表示2020年4月5日14点59分59秒的LocalDateTime对象。 另外，LocalDateTime也提供了toInstant()方法，可以将其转换为时间戳。我们可以通过调用toInstant()方法并传入所需的时区偏移量来获取时间戳。例如，可以使用now.toInstant(ZoneOffset.of("+08:00")).toEpochMilli()来获取当前时间的时间戳。 总之，LocalDateTime是用于表示日期和时间的对象，可以同时表示年月日和时分秒。可以使用of()方法创建LocalDateTime对象，并使用toInstant()方法将其转换为时间戳。<span class="em">1</span><span class="em">2</span><span class="em">3</span><span class="em">4</span>

LocalDateTime is a class in Java 8 that represents a date and time without a time zone. It stores the date and time values in the ISO-8601 format and provides various methods to manipulate them. The class is immutable, which means that the values cannot be changed once they are set. LocalDateTime is useful for representing events that occur in a specific location or for performing date and time calculations that are not dependent on time zones. For example, you can use LocalDateTime to represent the date and time of a user's activity on a website, or to calculate the duration between two dates and times. To create a LocalDateTime object, you can use the following code: ```java LocalDateTime now = LocalDateTime.now(); ``` This creates a LocalDateTime object with the current date and time. You can also create a LocalDateTime object with specific values using the `of` method: ```java LocalDateTime dateTime = LocalDateTime.of(2022, Month.JANUARY, 1, 0, 0, 0); ``` This creates a LocalDateTime object for January 1st, 2022 at midnight. Once you have a LocalDateTime object, you can use various methods to manipulate the values. For example, you can add or subtract days, hours, minutes, and seconds: ```java LocalDateTime newDateTime = dateTime.plusDays(7).minusHours(3); ``` This creates a new LocalDateTime object that is 7 days later than the original object and 3 hours earlier. Overall, LocalDateTime provides a flexible and powerful way to work with dates and times in Java without worrying about time zones.