revite/src/components/ui/DateDivider.tsx

import dayjs from "dayjs";
import styled, { css } from "styled-components";

const Base = styled.div<{ unread?: boolean }>`
    height: 0;
    display: flex;
    user-select: none;
    align-items: center;
    margin: 17px 12px 5px;
    border-top: thin solid var(--tertiary-foreground);

    time {
        margin-top: -2px;
        font-size: .6875rem;
        line-height: .6875rem;
        padding: 2px 5px 2px 0;
        color: var(--tertiary-foreground);
        background: var(--primary-background);
    }

    ${ props => props.unread && css`
        border-top: thin solid var(--accent);
    ` }
`;

const Unread = styled.div`
    background: var(--accent);
    color: white;
    padding: 5px 8px;
    border-radius: 60px;
    font-weight: 600;
`;

interface Props {
    date: Date;
    unread?: boolean;
}

export default function DateDivider(props: Props) {
    return (
        <Base unread={props.unread}>
            { props.unread && <Unread>NEW</Unread> }
            <time>
                { dayjs(props.date).format("LL") }
            </time>
        </Base>
    );
}