sproutcore set color of a labelview dynamically depending on currentdate

I am rewriting a custom view to regular views. For example

Pseudo code
if (date = today) {
    context.push('...; style="color:red; ...}
else {
    context.push('...; style="color:black; ...}
;

becomes

mondayLabelView: SC.LabelView.extend({
        layout: {top:90, left:700, width:200, height:18},
        classNames: ['App-monday'],
        valueBinding: SC.Binding.oneWay('App.someController.selectedMondayDate'),
        }),

Question, how to rewrite the dynamic color part?

I would suggest using the classNameBindings property to dynamically add a CSS class. This way, you do not need to use the style tag.

You can view more about it at http://blog.sproutcore.com/classnamebindings-easy-dynamic-css/ but the basic idea is as follows:

mondayLabelView: SC.LabelView.extend({
   layout: {...},
   valueBinding: SC.Binding.oneWay('App.someController.selectedMondayDate'),
   isToday: function() {
     // Psuedo-code, you'll probably need SC.DateTime to actually compare the dates
     return this.get('value') == today;
   }.property('value'),
   classNameBindings: ['isToday:date-is-today'],
})

Then, in your CSS, you would have something like:

.date-is-today {
  color: red;
}