I'm trying to get a UTC time from a Javascript front end to a Java backend. I wanted to acplish this by using Date.toISOString() and sending that object to the Java backend. However, an issue I noticed is that toISOString() returns the timestamp in YYYY-MM-DDTHH:mm:ss.sssZ format, and this format does not match any of the Java 8 pre-defined LocalDateTime formatters.

My question is, is there a best practice to do what I'm trying to do? I'm aware I can write a custom Java formatter to match the Javascript output. However, I wondered if there was a standard way to acplish this as it seems like a very mon case.

I'm trying to get a UTC time from a Javascript front end to a Java backend. I wanted to acplish this by using Date.toISOString() and sending that object to the Java backend. However, an issue I noticed is that toISOString() returns the timestamp in YYYY-MM-DDTHH:mm:ss.sssZ format, and this format does not match any of the Java 8 pre-defined LocalDateTime formatters.

My question is, is there a best practice to do what I'm trying to do? I'm aware I can write a custom Java formatter to match the Javascript output. However, I wondered if there was a standard way to acplish this as it seems like a very mon case.

• javascript
• java
• typescript
• datetime
• datetime-format

Share Improve this question Follow edited Jun 10, 2020 at 17:29 Arvind Kumar Avinash 79.8k1010 gold badges9292 silver badges135135 bronze badges asked Jun 10, 2020 at 16:45 JonJon 27711 gold badge22 silver badges1414 bronze badges 2

• 2 LocalDateTime in which time zone? If server time zone, use LocalDateTime.ofInstant(Instant.parse(dateString), ZoneId.systemDefault()) --- Are you sure you want a local date/time? – Andreas Commented Jun 10, 2020 at 16:53
• 2 LocalDateTime is the wrong class to use on the Java side. Your ISO string defines a point in time. LocalDateTime cannot represent that. Use Instant or ZonedDateTime. – Anonymous Commented Jun 10, 2020 at 17:32

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1 Answer 1

Sorted by: Reset to default 5

There are default ISO date formatters available. You can use following

LocalDateTime date = LocalDateTime.parse(str, DateTimeFormatter.ISO_DATE_TIME);

Note that this will assume the LocalDateTime of UTC timezone.

Update: as per Andreas' ment.

If you wish to get instance of LocalDateTime in server timezone, use

LocalDateTime.ofInstant(Instant.parse(str), ZoneId.systemDefault())