Using NodeJS, I want to format a
Date into the following string format:
var ts_hms = new Date(UTC); ts_hms.format("%Y-%m-%d %H:%M:%S");
How do I do that?
If you're using Node.js, you're sure to have EcmaScript 5, and so Date has a
toISOString method. You're asking for a slight modification of ISO8601:
new Date().toISOString() > '2012-11-04T14:51:06.157Z'
So just cut a few things out, and you're set:
new Date().toISOString(). replace(/T/, ' '). // replace T with a space replace(/\..+/, '') // delete the dot and everything after > '2012-11-04 14:55:45'
Or, in one line:
new Date().toISOString().replace(/T/, ' ').replace(/\..+/, '')
ISO8601 is necessarily UTC (also indicated by the trailing Z on the first result), so you get UTC by default (always a good thing).
UPDATE 2017-03-29: Added date-fns, some notes on Moment and Datejs
UPDATE 2016-09-14: Added SugarJS which seems to have some excellent date/time functions.
OK, since no one has actually provided an actual answer, here is mine.
A library is certainly the best bet for handling dates and times in a standard way. There are lots of edge cases in date/time calculations so it is useful to be able to hand-off the development to a library.
Here is a list of the main Node compatible time formatting libraries:
There are also non-Node libraries: