Java_8_UTC_date-time_to_formatted_string_and_viceversa.md

Java 8 UTC date-time to formatted string and viceversa

// YYYY-MM-DDTHH:mm:ssZ

// date ---> string
java.time.format.DateTimeFormatter.ISO_INSTANT.format(java.time.ZonedDateTime.now().truncatedTo(java.time.temporal.ChronoUnit.SECONDS))

// string ---> date
java.time.ZonedDateTime.parse('2016-07-18T13:26:45Z', java.time.format.DateTimeFormatter.ISO_INSTANT.withZone(java.time.ZoneOffset.UTC))

// java.time.ZoneId utcZoneId = java.time.ZoneOffset.UTC
java.time.Instant nowUtc = java.time.Clock.systemUTC().instant()

// alternative
private final LocalDateTime referenceDateTime = LocalDateTime.of(2016, 4, 1, expectedHourOfDay, 0)
private final Clock clockForTests = Clock.fixed(referenceDateTime.atZone(ZoneOffset.UTC).toInstant(), ZoneOffset.UTC);