optimizely-oui/src/components/DatePicker/fns.js

Optimizely's Component Library.

import React from "react";
import moment from "moment";

export const getDateString = date => {
    return (date && moment.isMoment(date) && date.format("MMM DD, YYYY")) || "";
};

export const getTimeString = date => {
    return (date && moment.isMoment(date) && date.format("HH:mm")) || "";
};

export const preserveTime = (prevDate, newDate) => {
    if (!prevDate || !newDate) {
        return newDate;
    }
    return newDate.set({
        hour: prevDate.get("hour"),
        minute: prevDate.get("minute"),
        second: prevDate.get("second"),
        millisecond: prevDate.get("millisecond"),
    });
};

export const getAvailableStartDatePhrase = ({ date }) => `Choose ${date} as your start date.`;
export const getAvailableEndDatePhrase = ({ date }) => `Choose ${date} as your end date.`;

// eslint-disable-next-line react/prop-types
export const getCustomMonthElement = ({ month }) => (
    <p className="oui-date-picker__month-title">
        {month.format("MMMM")} {month.year()}
    </p>
);

export const isOutsideAcceptableDateRange = (day, isOutsideRange, isFutureDateSelectable, isPastDateSelectable) => {
    if (isOutsideRange) {
        return isOutsideRange(day);
    }
    if (isPastDateSelectable && isFutureDateSelectable) {
        return false;
    }
    if (isFutureDateSelectable === false) {
        return day.isAfter(moment()) && !day.isSame(moment(), "day");
    }
    if (isPastDateSelectable === false) {
        return day.isBefore(moment()) && !day.isSame(moment(), "day");
    }
};