source: trunk/prototype/modules/calendar/js/timezone.js @ 5592

/*
        Todo Otimizar caulculo de timezone
        Objeto Date.toString() retorna a data com inserção do offset
        Objeto Date.getTime() retorna a data sem inserção do offset
*/

var objTime = DataLayer.dispatch( "timezones" );

Timezone = {
        currentOffset : new Date().getUTCOffset(),
        daylightSaving: isNaN(parseInt( objTime.isDaylightSaving )) ? 0 : parseInt( objTime.isDaylightSaving ),

        timezones: objTime.timezones,     
        timezone: function( tzId ){

                return this.timezones[ tzId || User.preferences.timezone ];

        },
        
        getDateCalendar: function(date, tzId, isDay){
                var timezone = this.timezone( tzId );

                if(!timezone)
                        return date;

                date = this.normalizeDate(date, false, true);

                return date.add({hours: parseInt(timezone.charAt(0) + timezone.charAt(2))  +  parseInt(isDay) });
        },
        
        getDateEvent: function(date, tzId, idCalendar, isDay, type){
                var timezone = this.timezone( tzId );
                var timezoneCurrent = this.timezone(DataLayer.get('calendar', idCalendar).timezone);

                if(timezone == timezoneCurrent)
                        return date;
                
                var to = parseInt(timezone.charAt(0) + timezone.charAt(2)) + parseInt(isDay.event[type]);
                var current = parseInt(timezoneCurrent.charAt(0) + timezoneCurrent.charAt(2)) + parseInt(isDay.calendar[type]);
                
                if(timezone.charAt(0) == timezoneCurrent.charAt(0))
                        hours =   (  to + (current * - 1)) ;
                else
                        hours =  to + (( current ) * (timezone.charAt(0) ==  '+'  ? -1 : 1)) ;
                
                return date.add({hours: hours});
        },
        
        normalizeDate: function(date, current, inverse){
                var offsetDate = !!current ? this.currentOffset : date.getUTCOffset();
                return date.add({hours: (parseInt(offsetDate.charAt(0) + offsetDate.charAt(2)) * (!!inverse ? -1 : 1) )});
        }
}