diffBeforeToday 계산 오류 수정

[leegeunhyeok]

Description

비교 대상 날짜가 24시간 미만인 경우 잘못된 결과가 반환되던 문제 수정

close #244

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2 Ignored Deployments

| Name | Status | Preview | Comments | Updated (UTC) | | :--- | :----- | :------ | :------- | :------ | | **up** | ⬜️ Ignored ([Inspect](https://vercel.com/dunggeun/up/5A36bMjoBRAEoGbZAodSEXj3FKvp)) | | | May 3, 2023 2:07pm | | **up-design-system** | ⬜️ Ignored ([Inspect](https://vercel.com/dunggeun/up-design-system/9QuL58vauYv23icYuQqJxL7s5akE)) | | | May 3, 2023 2:07pm |