Basic for Date [Java/Kotlin]

In this article, I would like to share some tips of Date class in Java.

🚌 Basic knowledge for Date Class in Java

  • Except a DB access part, use java.time.LocalDateTime or java.time.LocalDate. java.util.Date is NG.
  • In a DB access part, use java.sql.Timestamp exceptionally.

Example Code for Spring and Kotlin

private val rowMapper: RowMapper = RowMapper { rs, _ ->
id = rs.getInt("id"),
title = rs.getString("title"),
createdAt = rs.getTimestamp("created_at").toLocalDateTime()

🍣 Pattern to parse date string

Pattern to parse date string 2013-03-13T20:59:31+0000 is yyyy-MM-dd'T'HH:mm:ssZ.

@JsonFormat(pattern = "yyyy-MM-dd'T'HH:mm:ssZ")
val dateCreated: LocalDateTime
  • HH: 24-hour time notation
  • hh: 12-hour time notation

🐮 Convert unixtime to Date

Converting Unixtime into Date Object is as follows:

Date time = new Date((long) timeStamp * 1000);

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