Javascript - sort an array of strings that can contain letters, numbers, and dates

Question

var array=['sss_aaa_2013-09-25_part1.txt', 'sss_aaa_2013-09-25_part2.txt', 'sss_aaa_2013-09-25_part3.txt', 'sss_aaa_2013-09-25_part12.txt', 'sss_aaa_2013-09-25_part4.txt', 'sss_aaa_2013-09-26_part10.txt', 'sss_aaa_2013-09-26_part1.txt']; 

To do this, above the array I need to sort as shown below. How can i do this.

 var result=['sss_aaa_2013-09-25_part1.txt', 'sss_aaa_2013-09-25_part2.txt', 'sss_aaa_2013-09-25_part3.txt', 'sss_aaa_2013-09-25_part4.txt', 'sss_aaa_2013-09-25_part12.txt', 'sss_aaa_2013-09-26_part1.txt', 'sss_aaa_2013-09-26_part10.txt'];