js获取当前时间

本文最后更新于：2 年前

js获取当前时间

示例代码：

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<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <title>tools</title>
    <link rel="stylesheet" href="">
</head>

<body>
    <div>
        <button type="button" onclick="getNowtime()">获取当前时间</button>
        <span id="clock"></span>
    </div>
    <script type="text/javascript">
    function getNowtime() {
        var date = new Date();

        // string to date
        // new Date("2022-03-01").getFullYear()

        // var dateStr = '"' + date.getUTCFullYear() + '-' +
        //     (date.getUTCMonth() + 1).toPaddedString(2) + '-' +
        //     date.getUTCDate().toPaddedString(2) + 'T' +
        //     date.getUTCHours().toPaddedString(2) + ':' +
        //     date.getUTCMinutes().toPaddedString(2) + ':' +
        //     date.getUTCSeconds().toPaddedString(2) + 'Z"';

            console.log(date.getUTCFullYear());
            console.log((date.getUTCMonth() + 1).toPaddedString(2));
            console.log(date.getUTCDate());
            console.log(date.getUTCHours());
            console.log(date.getUTCMinutes());
            console.log(date.getUTCSeconds());


        // var b = a.toLocaleTimeString();
        // var c = a.toLocaleDateString();
        // document.getElementById("clock").innerHTML = c + "&nbsp" + b;
        // document.getElementById("clock").innerHTML = dateStr;
    }

    Date.prototype.toJSON = function() {
        return '"' + this.getUTCFullYear() + '-' +
            (this.getUTCMonth() + 1).toPaddedString(2) + '-' +
            this.getUTCDate().toPaddedString(2) + 'T' +
            this.getUTCHours().toPaddedString(2) + ':' +
            this.getUTCMinutes().toPaddedString(2) + ':' +
            this.getUTCSeconds().toPaddedString(2) + 'Z"';
    };


    function convertFullDateToString(date) {
        if (date == null) {
            date = new Date();
        }

        var strDate = "";
        var year = "";
        var month = "";
        var day = "";
        year = date.getFullYear();
        if (parseInt(date.getMonth() + 1, 10) < 10) {
            month = "0" + parseInt(date.getMonth() + 1, 10)
        } else {
            month = parseInt(date.getMonth() + 1, 10);
        }
        if (parseInt(date.getDate(), 10) < 10) {
            day = "0" + parseInt(date.getDate(), 10)
        } else {
            day = parseInt(date.getDate(), 10);
        }
        strDate = year + DATE_DELIMITER + month + DATE_DELIMITER + day;
        return strDate;
    }


    function checkFullDate(field) {
        field.value = trim(field.value);
        var strValue = field.value;
        if (strValue == "") {
            return false;
        }
        if (isNumeric(strValue)) {
            if (strValue.length > 6 && strValue.length < 9) {
                strValue = strValue.substring(0, 4) + DATE_DELIMITER + strValue.substring(4, 6) + DATE_DELIMITER + strValue.substring(6);
                field.value = strValue;
            } else {
                errorMessage("The correct date format is yyyy-MM-dd.");
                field.value = "";
                field.focus();
                field.select();
                return false;
            }
        }
        if (!isDate(strValue, DATE_DELIMITER) && !isDate(strValue) || strValue.substring(0, 1) == "0") {
            errorMessage("The correct date format is yyyy-MM-dd.");
            field.value = "";
            field.focus();
            field.select();
            return false;
        }
        var splitStrValue = strValue.split(DATE_DELIMITER);
        if (splitStrValue[1].length < 2) splitStrValue[1] = "0" + splitStrValue[1];
        if (splitStrValue[2].length < 2) splitStrValue[2] = "0" + splitStrValue[2];
        field.value = splitStrValue[0] + DATE_DELIMITER + splitStrValue[1] + DATE_DELIMITER + splitStrValue[2];
        return true;
    }

    function checkFullDateTime(field) {
        var dateT = field.value;
        if (dateT != "") {
            var reg = /^(\d{1,4})(-|\/)(\d{1,2})\2(\d{1,2}) (\d{1,2}):(\d{1,2}):(\d{1,2})$/;
            var r = dateT.match(reg);
            if (r == null) {
                errorMessage("The correct date format is yyyy-MM-dd HH:mm:ss.");
                field.value = "";
                field.focus();
                field.select();
                return false;
            }
            if (!isDateTime(dateT, DATE_DELIMITER) && !isDateTime(dateT) || dateT.substring(0, 1) == "0") {
                errorMessage("The correct date format is yyyy-MM-dd HH:mm:ss.");
                field.value = "";
                field.focus();
                field.select();
                return false;
            }
        } else {
            return false;
        }
        return true;
    }

    

    function validateDate(form) {

        var testResult = true; //store temp test result
        var isValid = true;

        var focusField = null;
        var i = 0;
        var fields = new Array();
        var oDate = eval("new " + jcv_retrieveFormName(form) + "_date()");
        for (var x in oDate) {
            if (!jcv_verifyArrayElement(x, oDate[x])) {
                continue;
            }
            //the input maybe an array
            var getVar = oDate[x][2];
            var isMultiLine = false;
            if (getVar("multiLine") == "true") {
                isMultiLine = true;
            }
            var loopFields = form[oDate[x][0]];
            if (!jcv_isFieldPresent(loopFields)) { //input not present
                continue;
            }
            var fieldsCount = loopFields.length;
            if (isMultiLine) {
                if (fieldsCount == undefined) { //is not array
                    fieldsCount = 1;
                    var tempLoopField = loopFields;
                    loopFields = new Array(tempLoopField);
                }
            } else {
                fieldsCount = 1;
                var tempLoopField = loopFields;
                loopFields = new Array(tempLoopField);
            }

            for (var index = 0; index < fieldsCount; index++) {
                var field = loopFields[index];
                //must set isValid = true and testResult = false
                if (((index == 0 && fieldsCount == 1) || index > 0) && isValid == false) {
                    isValid = true;
                    testResult = false;
                }
                //only check currentCheckField if it's not null
                if (currentCheckField != null && currentCheckField != field) {
                    continue;
                }

                //skip the first input if isMultiLine
                if (isMultiLine && index == 0) {
                    continue;
                }
                if (!jcv_isFieldPresent(field)) {
                    continue;
                }
                field.value = trim(field.value);
                var value = field.value;
                var isStrict = true;
                var datePattern = oDate[x][2]("datePatternStrict");
                // try loose pattern
                if (datePattern == null) {
                    datePattern = oDate[x][2]("datePattern");
                    isStrict = false;
                }
                //continue if has no value or datePattern
                if ((value.length <= 0) || (datePattern.length <= 0)) {
                    continue;
                }

                if (datePattern == "yyyy-MM-dd") {
                    //all number,convert to date
                    if (regExpTest(value, /\d+/g) == true && getByteLength(value) == 8) {
                        value = value.substring(0, 4) + DATE_DELIMITER +
                            value.substring(4, 6) + DATE_DELIMITER +
                            value.substring(6);
                    }
                    var reg = new RegExp("^(\\d+)" + DATE_DELIMITER + "(\\d{1,2})" + DATE_DELIMITER + "(\\d{1,2})$");
                    var r = value.match(reg);
                    if (r != null) {
                        var d = new Date(r[1], r[2] - 1, r[3], 1, 1, 1); //month start with zero in js
                        if (d.getFullYear() == r[1] && d.getMonth() == (r[2] - 1) && d.getDate() == r[3]) {
                            field.value = r[1] + DATE_DELIMITER + r[2] + DATE_DELIMITER + r[3];
                            value = field.value;
                            continue;
                        }
                    }
                } else if (datePattern == "yyyy-MM") {
                    var reg = new RegExp("^(\\d+)" + DATE_DELIMITER + "(\\d{1,2})$");
                    var r = value.match(reg);
                    if (r != null) {
                        r[2] = r[2] - 1;
                        var d = new Date(r[1], r[2], 1, 1, 1, 1); //month start with zero in js
                        if (d.getFullYear() == r[1] && d.getMonth() == r[2]) {
                            continue;
                        }
                    }
                } else if (datePattern == "yyyy-MM-dd HH") {
                    var reg = new RegExp("^(\\d+)" + DATE_DELIMITER + "(\\d{1,2})" + DATE_DELIMITER + "(\\d{1,2}) (\\d{1,2})$");
                    var r = value.match(reg);
                    if (r != null) {
                        r[2] = r[2] - 1;
                        var d = new Date(r[1], r[2], r[3], r[4], 1, 1); //month start with zero in js
                        if (d.getFullYear() == r[1] && d.getMonth() == r[2] && d.getDate() == r[3] && d.getHours() == r[4]) {
                            continue;
                        }
                    }
                } else if (datePattern == "yyyy-MM-dd HH:mm") {
                    var reg = new RegExp("^(\\d+)" + DATE_DELIMITER + "(\\d{1,2})" + DATE_DELIMITER + "(\\d{1,2}) (\\d{1,2}):(\\d{1,2})$");
                    var r = value.match(reg);
                    if (r != null) {
                        r[2] = r[2] - 1;
                        var d = new Date(r[1], r[2], r[3], r[4], r[5], 1); //month start with zero in js
                        if (d.getFullYear() == r[1] && d.getMonth() == r[2] && d.getDate() == r[3] && d.getHours() == r[4] &&
                            d.getMinutes() == r[5]) {
                            continue;
                        }
                    }
                } else if (datePattern == "yyyy-MM-dd HH:mm:ss") {
                    var reg = new RegExp("^(\\d+)" + DATE_DELIMITER + "(\\d{1,2})" + DATE_DELIMITER + "(\\d{1,2}) (\\d{1,2}):(\\d{1,2}):(\\d{1,2})$");
                    var r = value.match(reg);
                    if (r != null) {
                        r[2] = r[2] - 1;
                        var d = new Date(r[1], r[2], r[3], r[4], r[5], r[6]); //month start with zero in js
                        if (d.getFullYear() == r[1] && d.getMonth() == r[2] && d.getDate() == r[3] && d.getHours() == r[4] &&
                            d.getMinutes() == r[5] && d.getSeconds() == r[6]) {
                            continue;
                        }
                    }
                } else if (datePattern == "yyyy-MM-dd HH:mm:ss.SSS") {
                    var reg = new RegExp("^(\\d+)" + DATE_DELIMITER + "(\\d{1,2})" + DATE_DELIMITER + "(\\d{1,2}) (\\d{1,2}):(\\d{1,2}):(\\d{1,2}).(\\d{1,3})$");
                    var r = value.match(reg);
                    if (r != null) {
                        r[2] = r[2] - 1;
                        var d = new Date(r[1], r[2], r[3], r[4], r[5], r[6]); //month start with zero in js
                        if (d.getFullYear() == r[1] && d.getMonth() == r[2] && d.getDate() == r[3] && d.getHours() == r[4] &&
                            d.getMinutes() == r[5] && d.getSeconds() == r[6]) {
                            continue;
                        }
                    }
                } else { //if not support then continue;
                    continue;
                }


                if (i == 0) {
                    focusField = field;
                }
                fields[i++] = oDate[x][1];
                isValid = false;
                jcv_custom_processFieldAfterValid(isValid, field, fields, i - 1);

            }
        }
        if (fields.length > 0) {
            jcv_handleErrors(fields, focusField);
        }
        if (testResult == false) {
            isValid = false;
        }
        return isValid;
    }
    </script>
</body>

</html>
js获取当前时间
https://chris-z-su.github.io/2022/10/15/前端/js获取当前时间/
作者
Chris
发布于
2022年10月15日
许可协议