How can one produce an ISO date string "yyyy-MM-dd" from a Q date type? I looked at concatenating the various parts but am not even able to get the day/month, e.g. d:2015.12.01;d.month prints 2015.12, i.e. more than just the month.
q)"-" sv "." vs string[2015.12.01]
"2015-12-01"
vs vector from string, splits by "." above;
sv string to vector, join by "-" above.
Remember a string is just a char array, so you can grab each part as you require with indexing. But the above is useful as the resulting vector of vs gives a 3-length vector that you manipulate any way you like