C# about time (getting time in a specific format and getting the current timestamp in multiple ways)

1. Get the current time and convert it to a specific format:

string tradeTime = DateTime.Now.ToString("yyyyMMddHHmmss", DateTimeFormatInfo.InvariantInfo);

Set the desired time format:

string tradeTime = DateTime.Now.ToString("yyyy-MM-dd HH：mm：ss", DateTimeFormatInfo.InvariantInfo);

string tradeTime = DateTime.Now.ToString("yyyy年MM月dd日 HH时mm分ss秒", DateTimeFormatInfo.InvariantInfo);

2. Obtain the current timestamp (the timestamp obtained by taking milliseconds is 13 digits, and if only seconds are obtained, the timestamp is 10 digits)

第一种方法
/// <summary>  
        /// 获取当前时间戳  
        /// </summary>  
        /// <param name="bflag">为真时获取10位时间戳,为假时获取13位时间戳.bool bflag = true</param>  
        /// <returns></returns>  
        public static string GetTimeStamp(bool bflag)
        {
            TimeSpan ts = DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, 0);
            string ret = string.Empty;
            if (bflag)
                ret = Convert.ToInt64(ts.TotalSeconds).ToString();
            else
                ret = Convert.ToInt64(ts.TotalMilliseconds).ToString();

            return ret;
        }

Generally, only one type is used in a project, either 10 or 13 bits, so the following code can also be used directly

public static long GetTimestamp()
        {
            TimeSpan ts = DateTime.Now.ToUniversalTime() - new DateTime(1970, 1, 1);//ToUniversalTime()转换为标准时区的时间,去掉的话直接就用北京时间
            return (long)ts.TotalMilliseconds; //精确到毫秒
            //return (long)ts.TotalSeconds;//获取10位
        }

The only difference between the following methods is whether you need to get exceptions,

//生成unix格式时间
        public static long getUnix()
        {
            try
            {
                TimeSpan timespan = DateTime.UtcNow - new DateTime(1970, 1, 1);
                //return (long)timespan.TotalSeconds;//获取10位
                return (long)timespan.TotalMilliseconds;
            }
            catch (Exception)
            {
                return -1;
            }
        }

The first four complete methods and running results

public static long GetTimestamp()
        {
            TimeSpan ts = DateTime.Now.ToUniversalTime() - new DateTime(1970, 1, 1);//ToUniversalTime()转换为标准时区的时间,去掉的话直接就用北京时间
            return (long)ts.TotalMilliseconds; //精确到毫秒
            //return (long)ts.TotalSeconds;//获取10位
        }

        //生成unix格式时间
        public static long getUnix()
        {
            try
            {
                TimeSpan timespan = DateTime.UtcNow - new DateTime(1970, 1, 1);
                //return (long)timespan.TotalSeconds;//获取10位
                return (long)timespan.TotalMilliseconds;
            }
            catch (Exception)
            {
                return -1;
            }
        }

        public static long DateTimeToUnixTimestamp()
        {
            var start = new DateTime(1970, 1, 1, 0, 0, 0, DateTime.Now.Kind);
            return Convert.ToInt64((DateTime.Now - start).TotalSeconds);
        }

        public static long GetCurrentTimeUnix()
        {
            TimeSpan cha = (DateTime.Now - TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(1970, 1, 1)));
            long t = (long)cha.TotalSeconds;
            return t;
        }

Running results:

When you see the results, you will find that the second block is slightly different, probably the difference between Beijing time and the standard time zone. Please leave a message to correct any mistakes