Dgraph Live cannot parse negative years

[EnricoMi]

What version of Dgraph are you using?

v20.03.3

Have you tried reproducing the issue with the latest release?

Yes

What is the hardware spec (RAM, OS)?

Unrelated

Steps to reproduce the issue (command/config used to run Dgraph).

Start a fresh temporary dgraph instance with docker:

docker run -it --rm dgraph/standalone:v20.03.3 /bin/bash

Inside, run the following commands:

dgraph zero > /dev/null 2>&1 < /dev/null &
dgraph alpha --lru_mb 1024 > /dev/null 2>&1 < /dev/null &
echo "<a> <p> \"-0001-02-03\"^^<http://www.w3.org/2001/XMLSchema#date> ." > a.rdf

Wait a bit until dgraph alpha is up, then

dgraph live --files a.rdf

It fails on the date value with:

Error while processing data file "a.rdf": During parsing chunk in processLoadFile: while parsing line "<a> <p> \"-0001-02-03\"^^<http://www.w3.org/2001/XMLSchema#date> .\n": parsing time "-0001-02-03" as "2006-01-02T15:04:05": cannot parse "-0001-02-03" as "2006"

Negative years are defined by XMLSchema as BC: https://www.w3.org/TR/xmlschema-2/#dateTime.

Expected behaviour and actual result.

The example date should be parsed as -0001-02-03, i.e. 3rd of February of year 1 BC.

[all-seeing-code]

I think we parse date time here. Does this package support negative years?

[minhaj-shakeel]

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