Inconsistencies in jaq date formatting in versions 1.3 and 1.6

[bedilbek]

jaq --version
jaq -nc '"2024-05-15T15:38:00.200Z" | fromdate | todate'
jaq -nc '"2024-05-15T15:38:00.000Z" | fromdate | todate'

[bedilbek]

I would rather backport those date formatting as it was in version 1.3.0. Because I believe that formatting was more consistent and deterministic

[01mf02]

Hi @bedilbek, you're right, the jaq 1.6 behaviour does not seem to be very consistent.
This was due to a bug; I thought that for a floating-point number f, f / 1e6 is equivalent to f * 1e-6; it turns out that the former (division) preserves more precision than the latter (multiplication).
I also fixed the precision of todate to always print 6 decimal places if the input is a floating-point number. This should also contribute to making the formatting more consistent.
Again, thanks for spotting and reporting this!