Examples of date time and timezone fun in the JVM

datetimes.scala

import java.sql.Timestamp
import java.time.{Instant, OffsetDateTime}
import java.util.{Calendar, TimeZone}

val tz = TimeZone.getTimeZone("UTC")
val tzid = tz.toZoneId

val ts = Timestamp.from(Instant.now)

val inst = ts.toInstant
val odt = OffsetDateTime.ofInstant(ts.toInstant, tzid)
odt.getYear
odt.getMonthValue
odt.getDayOfMonth

val ldt = ts.toLocalDateTime
ldt.getYear
ldt.getMonthValue-1
ldt.getDayOfMonth

val calendar    = new Calendar.Builder().setInstant(ts.toInstant.getEpochSecond * 1000).setTimeZone(tz).build
calendar.getTime
calendar.get(Calendar.YEAR)
calendar.get(Calendar.MONTH)
calendar.get(Calendar.DAY_OF_MONTH)