// 解析时间字符串 格式标记为 yyyy MM dd HH mm ss SSS
var date_formats_flag = {
    "y": { idx: 0, name: "yyyy", len: 4, re: /^\d{4}$/, p: 0 },
    "M": { idx: 1, name: "MM", len: 2, re: /^\d{2}$/, p: 5 },
    "d": { idx: 2, name: "dd", len: 2, re: /^\d{2}$/, p: 8 },
    "H": { idx: 3, name: "HH", len: 2, re: /^\d{2}$/, p: 11 },
    "m": { idx: 4, name: "mm", len: 2, re: /^\d{2}$/, p: 14 },
    "s": { idx: 5, name: "ss", len: 2, re: /^\d{2}$/, p: 17 },
    "S": { idx: 6, name: "SSS", len: 3, re: /^\d{3}$/, p: 20 },
};
now = new Date();
function parseTime(sfmt, yMdHmsS) {
    if (!sfmt) {
        throw ("没有指定时间格式");
    }
    if (!yMdHmsS) {
        throw ("没有指定时间字符串");
    }
    try {
        if (sfmt.length != yMdHmsS.length) {
            throw ("长度不一致");
        }
        var dt = [null, null, null, null, null, null, null];
        for (var i = 0; i < sfmt.length; i++) {
            var fmt = date_formats_flag[sfmt[i]];
            if (fmt && sfmt.length >= i + fmt.len && sfmt.substr(i, fmt.len) == fmt.name) {
                if (yMdHmsS.length < i + fmt.len) {
                    throw (fmt.name + " " + i);
                }
                var ds = yMdHmsS.substr(i, fmt.len);
                if (!fmt.re.test(ds)) {
                    throw (fmt.name + " " + ds);
                }
                dt[fmt.idx] = parseInt(ds);
                i += fmt.len - 1;
            } else {
                if (yMdHmsS.length <= i || sfmt[i] != yMdHmsS[i]) {
                    throw (sfmt[i]);
                }
            }
        }
        var d = new Date(
            dt[0] == null ? now.getFullYear() : dt[0],
            dt[1] == null ? now.getMonth() : dt[1] - 1,
            dt[2] == null ? 1 : dt[2],
            dt[3],
            dt[4],
            dt[5],
            dt[6]
        );
        d.setMinutes(d.getMinutes() - d.getTimezoneOffset());
        return d;
    } catch (e) {
        throw ("时间格式错误，正确格式是 " + sfmt + "，" + e);
    }
}

function formatTime(sfmt, dt) {
    if (!sfmt) {
        throw ("没有指定时间格式");
    }
    if (!dt) {
        throw ("没有指定时间");
    }
    var ds = dt.toJSON();
    var s = "";
    for (var i = 0; i < sfmt.length; i++) {
        var fmt = date_formats_flag[sfmt[i]];
        if (fmt && sfmt.length >= i + fmt.len && sfmt.substr(i, fmt.len) == fmt.name) {
            s += ds.substring(fmt.p, fmt.p + fmt.len);
            i += fmt.len - 1;
        } else {
            s += sfmt[i];
        }
    }
    return s;
}