react native 日期转换

使用momont插件

import moment from "moment/moment";

//使用方法  获取当前日期  并且转成特定的字符串
export const toYear = (moment(new Date()).format('YYYY'))
export const toMonth = (moment(new Date()).format('MM'))
export const toDay = (moment(new Date()).format('DD'))
//将时间戳转为时间
  let date = new Date(timeStamp).toDateString()
   let time = moment(date).format('MM-DD hh:mm')
//获取当月的天数
export const getDaysOfMonth = (year, month) => {
    var day = new Date(year, month, 0)
    var dayCount = day.getDate()
    return dayCount
}
export default class DateUtil {

    static formatDate(date,fmt){
        var o = {
            "M+": date.getMonth() + 1, //月份
            "d+": date.getDate(), //日
            "h+": date.getHours(), //小时
            "m+": date.getMinutes(), //分
            "s+": date.getSeconds(), //秒
            "q+": Math.floor((date.getMonth() + 3) / 3), //季度
            "S": date.getMilliseconds() //毫秒
        };
        if (/(y+)/.test(fmt)) fmt = fmt.replace(RegExp.$1, (date.getFullYear() + "").substr(4 - RegExp.$1.length));
        for (var k in o)
            if (new RegExp("(" + k + ")").test(fmt))
                fmt = fmt.replace(RegExp.$1, (RegExp.$1.length == 1) ? (o[k]) : (("00" + o[k]).substr(("" + o[k]).length)));
        return fmt;

    }

    static stringToDate(str){
        str = str.replace(/-/g,'/')
        let date = new Date(str)
        // date.setDate(date.getDate() + 1)
        return date
    }

    // 2.获取几天之前或几天之后的日期 传入date和天数
    static getBeforeDayDate(date,day) {
        let timestamp = date.getTime();
        // 获取day天前的日期
        return new Date(timestamp - day * 24 * 3600 * 1000);
    }

    static getAfterDayDate(date,day) {
        let timestamp = date.getTime();
        // 获取day天之后的日期
        return new Date(timestamp + day * 24 * 3600 * 1000);

    }

}

//获取当月的天数
const getDaysOfMonth = (year, month) => {
    let day = new Date(year, month, 0)
    let dayCount = day.getDate()
    return dayCount
}

//获取是当月第一天是周几
const getFirstDay = (year, month) => {
    let day = new Date(year, month - 1)
    let dayCount = day.getDay()
    if (dayCount == 0) {
        dayCount = 7
    }
    return dayCount
}