Java.time API: Examples and Reference in Scala
Last updated:Table of Contents
- Format ZonedDateTime with format String
- Epoch time to ZonedDateTime
- LocalDate to SQL Date
- SQL Date to LocalDate
- String to LocalDate
- Today's Date
- LocalDate from String
- Build LocalDate object
- LocalDate from year,month,day
Starting with Java 8, the old JodaTime library for dates has been sort of merged into the main Java standard library.
Format ZonedDateTime with format String
You need to use java.time.format.DateTimeFormatter; you can use predefined constants like ISO_DATE or you can define you own pattern:
Using predefined patterns via constants:
import java.time._
import java.time.format._
// as of this posting
val zdt = ZonedDateTime.now()
//res0: zdt: java.time.ZonedDateTime = 2016-04-01T02:07:22.549-03:00[America/Sao_Paulo]
// using useful constants in class DateTimeFormatter
zdt.format(DateTimeFormatter.ISO_DATE)
// res1: String = 2016-04-01-03:00
Using custom patterns:
// using a custom string with .ofPattern()
zdt.format(DateTimeFormatter.ofPattern("yyyy-MM-dd"))
//res2: String = 2016-04-01
Epoch time to ZonedDateTime
Epoch time (also know as Unix time) is the number of seconds (or milliseconds) elapsed since 1 January, 1970. GMT
import java.time._
//using milliseconds
// refers to Mon, 29 Aug 2016 18:28:28.075 GMT
val millis = 1472495308075L
val asZdtMillis = Instant.ofEpochMilli(millis).atZone(ZoneId.of("UTC"))
//asZdtMillis: java.time.ZonedDateTime = 2016-08-29T18:28:28.075Z[UTC]
import java.time._
// using seconds
// refers to Mon, 29 Aug 2016 18:28:28 GMT
// (same date as above, without milliseconds)
val seconds = 1472495308L
val asZdtSeconds = Instant.ofEpochSecond(seconds).atZone(ZoneId.of("UTC"))
// java.time.ZonedDateTime = 2016-08-29T18:28:28Z[UTC]
LocalDate to SQL Date
Use Date.valueOf(localdate.toString):
import java.time.LocalDate
import java.sql.Date
val ld = LocalDate.of(2019,12,1)
val sqlDate = Date.valueOf(ld.toString)
// Date = 2019-12-01
SQL Date to LocalDate
Simply use sqlDate.toLocalDate
import java.time.LocalDate
import java.sql.Date
val sqlDate = Date.valueOf("2019-12-01")
val ld = sqlDate.toLocalDate
// LocalDate = 2019-12-01
String to LocalDate
Use LocalDate.parse(...)
import java.time.LocalDate
val date = LocalDate.parse("2021-01-29")
# res8: java.time.LocalDate = 2021-01-29
Today's Date
Use LocalDate.now()
import java.time.LocalDate
LocalDate.now()
# res8: java.time.LocalDate = 2022-11-25
LocalDate from String
As above, just use LocalDate.parse()
import java.time.LocalDate
val date = LocalDate.parse("2022-02-25")
# res8: java.time.LocalDate = 2021-02-25
Build LocalDate object
Use LocalDate.of(year, month, day)
import java.time.LocalDate
val date = LocalDate.of(2021,1,29)
# res8: java.time.LocalDate = 2021-01-29
LocalDate from year,month,day
Again, as above: just use LocalDate.of(year, month, day)
import java.time.LocalDate
val date = LocalDate.of(2022,2,25)
# res8: java.time.LocalDate = 2022-02-22