In [Configuration] -> [Maintenance] screen, I can't input 24:00 when I use calendar.

In 417th line of frontend/php/js/class.calendar.js

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sethour: function(){
var hour = parseInt(this.clndr_hour.value,10);
if((hour>-1) && (hour < 24))

{ this.hour = hour; this.syncSDT(); }

else

{ this.clndr_hour.value = this.hour; }

},
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