How can I format time durations exactly using Moment.js?
javascript, momentjs
Solution
There's a plugin for formatting duration in moment.js : moment-duration-format
If it doesn't do what you need, then you should extend `moment.duration.fn`. If you don't support many locales, it should be easy enough.
In any case, I'd recommend to read the thread of this feature request.
Problem
I would like to do the following, given two dates in UTC formatting: ``` var start = "2014-01-13T06:00:00.0000000Z"; var end = "2014-01-13T14:16:04.0000000Z"; ``` I would like to get the exact time span that passes between these two times, such as ``` 8h 16m ``` I have tried using the following: ``` var duration = moment(moment(end) - moment(start)).format('hh[h] mm[m]'); ``` But this does not work with days. Moreover, it does not work with days, since they are always >=1 even if <24 hours pass. I have also tried twix.js to get the length, but its formatting doesn't support creating the format specified above, or I could not find the way to do so in its documentation. Basically I am looking for an exact version of `twix.humanizeLength()`. Moment.js's `a.diff(b)` provides only total durations, it can give me the length of the time span in minutes, hours or days, but not calculated using remainders. My current solution is to use `diff` to create the ranges and then use modulo to calculate remainders, but this is not very elegant: ``` var days = moment(end).diff(start, 'days'); var hours = moment(end).diff(start, 'hours') % 24; var minutes = moment(end).diff(start, 'minutes') % 60; var duration = ((days > 0) ? days + 'd ' : '') + ((hours > 0) ? hours + 'h ' : '') + ((minutes > 0) ? minutes + 'm ' : ''); ``` The question: Is there any smarter way to do this in either moment.js or twix.js, or should I take my time and develop my own moment.js plugin?