How to convert dates to months format

I've data in this format

"Admission _date" : "2020-01-28",
          "id" : 78

when I visualize the data in this format I get results like this
X axis : admission date
Y axis : count of records

I want the months on x axis by adding same data
like this

How I can get results like this?

specify the date histogram "minimum interval" of months

I did the same

but here I'm getting a particular date for each month
but I want the date in the form of month (names)

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