bizhours.js is a lightweight javascript library for parsing storing, displaying and querying a business' open hours. It's developed and maintained at Zendesk for the link-sf.org project.

 > var h = new BizHours({sun: "9am-7pm", mon: "10am-7pm", wed: "4am-5am", thu: "4am-5am"})
 > h.humanize().forEach(function(day) { 
      console.log(day.day); 
      console.log(day.hours) 
   });

   Sunday
   9am - 7pm
   Monday
   10am - 7pm
   Tuesday
   null
   Wednesday
   4am - 5am
   Thursday
   4am - 5am
   Friday
   null
   Saturday
   null

 > h.humanizeCondensed().forEach(function(range) {
      console.log(range.day);
      console.log(range.hours)
   });

   Sunday
   9am - 7pm
   Monday
   10am - 7pm
   Wednesday - Thursday
   4am - 5am

constructor new BizHours(hoursObject)
Creates a new BizHours object from hoursObject input. hoursObject is a javascript obj with keys of ["mon", "tue", "wed", "thu", "fri", "sat", "sun"], and values of the following format: "9am-1pm, 1:30pm - 5:30pm". var h = new BizHours({mon: "9am - 1pm", tue: "11am - 3pm"})

addDay .addDay(dayName, timeString)
Sets dayName's open hours to the parsed value of timeString. The format of dayName and timeString follow the constructor's arguments.

h.addDay("mon", "5pm-7pm")

merge .merge(hoursObject)
Merge hoursObject (a bizHours object) into this object.

h.merge(other)

humanize .humanize()
Return an array objects representing open hours

> h.humanize()
[
  {day: "Monday", 
   hours: "9am-5pm"},
  {day: "Tuesday", 
   hours: "9am-5pm"},
  ...
]

humanizeCondensed .humanizeCondensed()
The same as .humanize, but with runs of days that have the same hours collapsed into one array entry:

> h.humanizeCondensed()
[
  {day: "Monday - Tuesday", 
   hours: "9am-5pm"},
  {day: "Wednesday", 
   hours: "11am-5pm"},
  ...
]

within .within(date)
Returns whether the given date is within the business' open hours (assuming that the date and biz hours are within the same timezone).