time differences should be durations

[mccanne]

echo '{ts:2018-03-24T17:30:20Z}' | zq 'cut delta:=(ts+1s)-ts' -

is

{delta:1970-01-01T00:00:01Z}

but should be

{delta:1s}

[philrz]

Yep. This has been with us for a while. I just closed #1792 as a duplicate.

[philrz]

Just closed another duplicate, #3741. Note that community user @cogphn took the time to react with a 🎉 emoji to that other issue, so there's outside interest in seeing this addressed. I've therefore added the Community label here and will discuss with the team boosting its priority.

[philrz]

Verified in Zed commit 28f95a3.

The output is now a duration type as was originally anticipated.

$ zq -version
Version: v1.2.0-64-g28f95a3c

$ echo '{ts:2018-03-24T17:30:20Z}' | zq 'cut delta:=(ts+1s)-ts' -
{delta:1s}

Thanks @nwt!