time_t到.NET的转换-优快云博客

本文提供了两种将UNIX时间戳转换为本地日期时间的方法。方法一通过直接加秒的方式实现，方法二则通过定义私有静态类来处理。此外还介绍了如何进行文件时间和OLE时间的转换。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

方法1：

public DateTime UNIXtoDateTime(long seconds) {
double secs = Convert.ToDouble(seconds);
DateTime dt = new DateTime(1970, 1, 1, 0, 0, 0).AddSeconds(secs);

return System.TimeZone.CurrentTimeZone.ToLocalTime(dt);
}

方法2：

public sealed class ConvertTime
{
/// <summary>
/// Private constructor to prevent the class from being instantiated.
/// </summary>
private ConvertTime() {}

private static DateTime origin = System.TimeZone.CurrentTimeZone.ToLocalTime(new DateTime(1970, 1, 1, 0, 0, 0));

/// <summary>
/// time_t is an int representing the number of seconds since Midnight UTC 1 Jan 1970 on the Gregorian Calendar.
/// </summary>
/// <param name="time_t"></param>
/// <returns></returns>
public static DateTime ToDateTime(int time_t)
{
DateTime convertedValue = origin + new TimeSpan(time_t * TimeSpan.TicksPerSecond);
if (System.TimeZone.CurrentTimeZone.IsDaylightSavingTime(convertedValue) == true)
{
System.Globalization.DaylightTime daylightTime = System.TimeZone.CurrentTimeZone.GetDaylightChanges(convertedValue.Year);
convertedValue = convertedValue + daylightTime.Delta;
}
return convertedValue;
}

/// <summary>
/// time_t is an int representing the number of seconds since Midnight UTC 1 Jan 1970 on the Gregorian Calendar.
/// </summary>
/// <param name="time"></param>
/// <returns></returns>
public static int To_time_t(DateTime time)
{
DateTime convertedValue = time;
if (System.TimeZone.CurrentTimeZone.IsDaylightSavingTime(convertedValue) == true)
{
System.Globalization.DaylightTime daylightTime = System.TimeZone.CurrentTimeZone.GetDaylightChanges(convertedValue.Year);
convertedValue = convertedValue - daylightTime.Delta;
}
long diff = convertedValue.Ticks - origin.Ticks;
return (int)(diff / TimeSpan.TicksPerSecond);
}
}

Also you can convert filetime or oledate to System.DateTime.
FILETIME to/from System.DateTime
Use System.DateTime.FromFileTime() and System.DateTime.ToFileTime().
OLE date to/from System.DateTime
Use System.DateTime.FromOADate() and System.DateTime.ToOADate().