C# 时间戳的相关操作

一般的 时间戳 格式分为两种 即 10位(秒)时间戳 与 13位(毫秒)时间戳

            时间戳 类型也分为两种 即 本地时间戳 与 世界统一(utc)时间戳

废话不多说，直接上代码：

一、时间戳获取方法

/// <summary>
/// 获取时间戳
/// </summary>
/// <param name="timekind">时间类型（只能为 local、utc）</param>
/// <param name="format">时间戳格式（只能为 10、13）</param>
/// <returns></returns>
private double gettimestamp(int format, datetimekind timekind)
{
    timespan timespan = new timespan();

    switch (timekind)
    {
        case datetimekind.utc: timespan = datetime.utcnow - new datetime(1970, 1, 1, 0, 0, 0, timekind); break;
        case datetimekind.local: timespan = datetime.now - new datetime(1970, 1, 1, 0, 0, 0, timekind); break;
        default: throw new exception("时间类型 只能为 local、utc");
    }

    switch (format)
    {
        case 10: return timespan.totalseconds;
        case 13: return timespan.totalmilliseconds;
        default: throw new exception("时间戳格式 只能为 10、13");
    }
}

/// <summary>
/// 获取10位时间戳
/// </summary>
/// <param name="timekind">时间类型（只能为 local、utc，默认 local）</param>
/// <returns></returns>
public int get10timestamp(datetimekind timekind = datetimekind.local)
{
    return convert.toint32(gettimestamp(10, timekind));
}

/// <summary>
/// 获取13位时间戳
/// </summary>
/// <param name="timekind">时间类型（只能为 local、utc，默认 local）</param>
/// <returns></returns>
public long get13timestamp(datetimekind timekind = datetimekind.local)
{
    return convert.toint64(gettimestamp(13, timekind));
}

二、时间戳验证方法

/// <summary>
/// 验证时间戳（10位、13位皆可）
/// </summary>
/// <param name="timestamp">时间戳</param>
/// <param name="timediff">允许时差（10位时单位为 秒，13位时单位为 毫秒）</param>
/// <param name="timekind">时间类型（只能为 local、utc，默认 local）</param>
/// <returns></returns>
public bool validatetimestamp(double timestamp, int timediff, datetimekind timekind = datetimekind.local)
{
    timespan timespan = new timespan();

    switch (timekind)
    {
        case datetimekind.utc: timespan = datetime.utcnow - new datetime(1970, 1, 1, 0, 0, 0, timekind); break;
        case datetimekind.local: timespan = datetime.now - new datetime(1970, 1, 1, 0, 0, 0, timekind); break;
        default: throw new exception("时间类型 只能为 local、utc");
    }

    double nowtimestamp = 0;  //现在的时间戳
    int format = timestamp.tostring("f0").length;

    switch (format)
    {
        case 10: nowtimestamp = timespan.totalseconds; break;
        case 13: nowtimestamp = timespan.totalmilliseconds; break;
        default: throw new exception("时间戳格式 错误");
    }

    double nowtimediff = nowtimestamp - timestamp;  //现在的时差

    if (-timediff <= nowtimediff && nowtimediff <= timediff)
        return true;
    else
        return false;
}

三、由 时间戳 转换为 datetime 方法

/// <summary>
/// 将时间戳装换为datetime（10位、13位皆可）
/// </summary>
/// <param name="timestamp">时间戳</param>
/// <param name="timekind">时间类型（只能为 local、utc，默认 local）</param>
/// <param name="totimekind">返回的时间类型（只能为 local、utc，默认与 timekind 一致）</param>
/// <returns></returns>
public datetime timestamptodatetime(double timestamp, datetimekind timekind = datetimekind.local, datetimekind totimekind = datetimekind.unspecified)
{
    datetime starttime;
    totimekind = timekind;

    switch (timekind)
    {
        case datetimekind.utc: starttime = new datetime(1970, 1, 1, 0, 0, 0, timekind); break;
        case datetimekind.local: starttime = new datetime(1970, 1, 1, 0, 0, 0, timekind); break;
        default: throw new exception("时间类型 只能为 local、utc");
    }

    datetime newtime;
    int format = timestamp.tostring("f0").length;

    switch (format)
    {
        case 10: newtime = starttime.addseconds(timestamp); break;
        case 13: newtime = starttime.addmilliseconds(timestamp); break;
        default: throw new exception("时间戳格式 错误");
    }

    if (newtime.kind != totimekind)
        newtime = totimekind == datetimekind.local ? newtime.tolocaltime() : newtime.touniversaltime();

    return newtime;
}