NetCDF: Support more time units

Description

On NetCDF, time coordinate axis usually expresses the reference time through the "units" attribute using a syntax like this:

"seconds since 2012-01-01 00:00:00" or
"hours since 2014-02-04"...

We are currently supporting days, hours, minutes, seconds.
We should also support singular form such as day, hour, minute, second.

Environment

None

Assignee

Unassigned

Reporter

codehaus

Triage

None

Components

Fix versions

Affects versions

Priority

Low
Configure