time and date formatting functions written in LiveScript

aux.time_formatting.ls

aux =
    # formatting
    timezoneOffset: new Date().getTimezoneOffset!
    getTime: (t = Date.now!) !->
        return new Date(t - timezoneOffset *60_000min_to_ms).toISOString! .replace(/.+?T|\..+/g, '')
    getDateTime: (t = Date.now!) !->
        return new Date(t - timezoneOffset *60_000min_to_ms).toISOString! .replace(/T|\..+/g, ' ')
    getDate: (t = Date.now!) !->
        return new Date(t - timezoneOffset *60_000min_to_ms).toISOString! .replace(/T.+/g, '')
    getISOTime: (t = new Date)!->
        return t.toISOString! .replace(/T|\..+/g, " ")
    parseISOTime: (t) !->
        return new Date(t) - timezoneOffset *60_000min_to_ms

    # show a timespan (in ms) in a human friendly format (e.g. "2 hours")
    humanTime: (diff, shortFormat) !->
        if diff < 0
            return "-#{humanTime -diff}"
        else if not shortFormat and diff < 2_000ms # keep in sync with ago()
            return "just now"
        b=[60to_min, 60to_h, 24to_days, 360.25to_years]; c=0
        diff /= 1000to_s
        while diff > 2*b[c] then diff /= b[c++]
        if shortFormat
            return "#{Math.round diff}#{<[ s m h d y ]>[c]}"
        else
            return "#{Math.round diff} #{<[ seconds minutes hours days years ]>[c]}"

    # show a timespan (in s) in a format like "mm:ss" or "hh:mm:ss" etc
    mediaTime: (dur) !->
        return "-#{mediaTime -dur}" if dur < 0
        # usually the user would rather read 580 hours as "580:00:00" instead of "24:04:00:00"
        m=0
        if dur >= 60
            m = ~~(dur / 60); dur %= 60
            if m >= 60
                h = ~~(m / 60); m %= 60
        return "#{if h then pad(h)+":" else ''}#{pad(m)}:#{pad(~~dur)}"

    # create string saying how long ago a given timestamp (in ms since epoche) is
    ago: (d) !->
        d = Date.now! - d
        if d < 2_000ms # keep in sync with humanTime()
            return "just now"
        else
            return "#{humanTime(d)} ago"