How I can sort an array by the first value. Below is the array example

[
    [
        14th Aug,
        8th Aug,
    ],
    [
        8th Aug,
        22th Aug,
    ],
    [
        6th Aug,
        14th Aug,
    ] 
]

As result, I need to get a new array such as

[
   [
        6th Aug,
        14th Aug,
    ],
    [
        8th Aug,
        22th Aug,
    ],
    [
        14th Aug,
        8th Aug,
    ] 
]

So only the first value must be taken into account for sorting