问题
I'm running a query using Cypher in Neo4J where I have to compare a createdAt property of a node against a given time unit in Epoch milliseconds. This createdAt property is a string in the DateTime format, which is defined as -
DateTime
date with a precision of miliseconds, encoded as a string with the following format: yyyy-mm-ddTHH:MM:ss.sss+0000, where yyyy is a four-digit integer representing the year, the year, mm is a two-digit integer representing the month and dd is a two-digit integer representing the day, HH is a two-digit integer representing the hour, MM is a two digit integer representing the minute and ss.sss is a five digit fixed point real number representing the seconds up to milisecond precision. Finally, the +0000 of the end represents the timezone, which in this case is always GMT.
Here are a couple of values of this property - 2011-03-21T19:32:38.295+0000, 2012-03-09T17:59:05.367+0000.
I came across the Temporal Values documentation on Neo4j, but couldn't find a way to perform the conversion.
When I execute some of the given examples, like this -
RETURN datetime('2015-06-24T12:50:35.556+0100') AS theDateTime
I get the error -
Neo.ClientError.Statement.SyntaxError: Unknown function 'datetime' (line 1, column 16 (offset: 15))
Would appreciate any help!
回答1:
The temporal functions were added in neo4j version 3.4.0, and I have verified that your query works in that version.
Make sure you are using an appropriately recent version of neo4j.
来源：https://stackoverflow.com/questions/51168792/converting-datetime-to-epoch-milliseconds-using-cypher-in-neo4j