获取哪个日期范围是Javascript中的日期

Question

I have got an array with one or more arrays:

For example, with one array:

var array1 = [['2','name','surname','2014-01-01']];

Or with more than one(It is dynamic, sometimes it comes with 1 other with 2, with 3,... but always with the date ordered 'asc').

var array1 = [['2','name','surname','2014-01-01'],['2','name1','surname1','2014-02-02'],['2','name2','surname2','2014-03-03'],['2','name3','surname3','2014-04-02']];

Then I have got a date:

var givenDate="2014-03-28";

I want to get the array where givenDate is in the range. I want the beginning array. In this case the 3rd array: ['2','name2','surname2','2014-03-03']

I dont know which is the most effective way.

Thanks

Answer 1

EDIT: This will either return an array with an exact match of the givendate. If no exact match is found it will return the array with the date closest to the givendate:

var array1 = [['2','name','surname','2014-01-01'],['2','name1','surname1','2014-02-02'],['2','name2','surname2','2014-03-03'],['2','name3','surname3','2014-04-02']];
var givenDate = '2014-02-12';
var key = false;
var index;
var differences = [];
for( index=0; index < array1.length; ++index ){
    if( array1[index][3] == givenDate ){
        key = index;
    }       
}
if( !key ){
    for( index=0; index < array1.length; ++index ){
        difference = givenDate.replace(/-/g, '') - array1[index][3].replace(/-/g, '')
        differences[difference] = [];
        differences[difference]['key'] = index;
    }   
}
if( key ){
    alert( 'Exact match for given date is found and holds key: ' + key );
    alert( 'Resulting array: ' + array1[key] );         
}
if( differences.length > 0 ){
    alert( 'Found a nearest key' );
    var firstKey = getFirstKey(differences);
    alert( 'Resulting Array: ' + array1[differences[firstKey]['key']] );
}
function getFirstKey( data ) {
    for (elem in data ) 
        return elem;
}