How can I convert a Unix timestamp to DateTime and vice versa

Question

There is this example code  but then it starts talking about millisecond   nanosecond problems   The same question is on MSDN  Seconds since the Unix epoch in C    This is what I ve got so far   public Double CreatedEpoch     get         DateTime epoch   new DateTime 1970  1  1  0  0  0  0  ToLocalTime        TimeSpan span    this Created ToLocalTime   - epoch       return span TotalSeconds        set         DateTime epoch   new DateTime 1970  1  1  0  0  0  0  ToLocalTime        this Created   epoch AddSeconds value

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I found the right answer just by comparing the conversion to 1 1 1970 w o the local time adjustment   DateTime date   new DateTime 2011  4  1  12  0  0  0   DateTime epoch   new DateTime 1970  1  1  0  0  0  0   TimeSpan span    date - epoch   double unixTime  span TotalSeconds

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You can use  DateTimeOffset  For example  I have DateTime object var dateTime1 DateTime Now   If I want convert the it to Unix time stamps  I can be achieve as follows var unixTimeSeconds  new DateTimeOffset dateTime1  ToUnixTimeSeconds    If you want convert unix timeStamp to normal DateTime  you can use this code piece  var dateTime2   DateTimeOffset FromUnixTimeSeconds unixTimeSeconds  LocalDateTime   or var dateTime2   DateTimeOffset FromUnixTimeSeconds unixTimeSeconds  UtcDateTime   For more information please visit this link   DateTimeOffset ToUnixTimeSeconds Method  DateTimeOffset FromUnixTimeSeconds

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Here s what you need   public static DateTime UnixTimeStampToDateTime  double unixTimeStamp            Unix timestamp is seconds past epoch     System DateTime dtDateTime   new DateTime 1970 1 1 0 0 0 0 System DateTimeKind Utc       dtDateTime   dtDateTime AddSeconds  unixTimeStamp   ToLocalTime        return dtDateTime      Or  for Java  which is different because the timestamp is in milliseconds  not seconds    public static DateTime JavaTimeStampToDateTime  double javaTimeStamp            Java timestamp is milliseconds past epoch     System DateTime dtDateTime   new DateTime 1970 1 1 0 0 0 0 System DateTimeKind Utc       dtDateTime   dtDateTime AddMilliseconds  javaTimeStamp   ToLocalTime        return dtDateTime

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System DateTimeOffset Now ToUnixTimeSeconds

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Be careful  if you need precision higher than milliseconds    NET  v4 6  methods  e g  FromUnixTimeMilliseconds  don t provide this precision   AddSeconds and AddMilliseconds also cut off the microseconds in the double   These versions have high precision   Unix -  DateTime  public static DateTime UnixTimestampToDateTime double unixTime        DateTime unixStart   new DateTime 1970  1  1  0  0  0  0  System DateTimeKind Utc       long unixTimeStampInTicks    long   unixTime   TimeSpan TicksPerSecond       return new DateTime unixStart Ticks   unixTimeStampInTicks  System DateTimeKind Utc       DateTime -  Unix  public static double DateTimeToUnixTimestamp DateTime dateTime        DateTime unixStart   new DateTime 1970  1  1  0  0  0  0  System DateTimeKind Utc       long unixTimeStampInTicks    dateTime ToUniversalTime   - unixStart  Ticks      return  double  unixTimeStampInTicks   TimeSpan TicksPerSecond

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A Unix tick is 1 second  if I remember well   and a  NET tick is 100 nbsp nanoseconds    If you ve been encountering problems with nanoseconds  you might want to try using AddTick 10000000   value

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DateTime to UNIX timestamp   public static double DateTimeToUnixTimestamp DateTime dateTime        return  TimeZoneInfo ConvertTimeToUtc dateTime  -             new DateTime 1970  1  1  0  0  0  0  System DateTimeKind Utc   TotalSeconds

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See IdentityModel EpochTimeExtensions  public static class EpochTimeExtensions            lt summary gt          Converts the given date value to epoch time           lt  summary gt      public static long ToEpochTime this DateTime dateTime                var date   dateTime ToUniversalTime            var ticks   date Ticks - new DateTime 1970  1  1  0  0  0  0  DateTimeKind Utc  Ticks          var ts   ticks   TimeSpan TicksPerSecond          return ts                  lt summary gt          Converts the given date value to epoch time           lt  summary gt      public static long ToEpochTime this DateTimeOffset dateTime                var date   dateTime ToUniversalTime            var ticks   date Ticks - new DateTimeOffset 1970  1  1  0  0  0  TimeSpan Zero  Ticks          var ts   ticks   TimeSpan TicksPerSecond          return ts                  lt summary gt          Converts the given epoch time to a  lt see cref  DateTime   gt  with  lt see cref  DateTimeKind Utc   gt  kind           lt  summary gt      public static DateTime ToDateTimeFromEpoch this long intDate                var timeInTicks   intDate   TimeSpan TicksPerSecond          return new DateTime 1970  1  1  0  0  0  0  DateTimeKind Utc  AddTicks timeInTicks                   lt summary gt          Converts the given epoch time to a UTC  lt see cref  DateTimeOffset   gt            lt  summary gt      public static DateTimeOffset ToDateTimeOffsetFromEpoch this long intDate                var timeInTicks   intDate   TimeSpan TicksPerSecond          return new DateTimeOffset 1970  1  1  0  0  0  TimeSpan Zero  AddTicks timeInTicks

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A Unix tick is 1 second  if I remember well   and a  NET tick is 100 nbsp nanoseconds    If you ve been encountering problems with nanoseconds  you might want to try using AddTick 10000000   value

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The latest version of  NET  v4 6  has added built-in support for Unix time conversions  That includes both to and from Unix time represented by either seconds or milliseconds    Unix time in seconds to UTC DateTimeOffset      DateTimeOffset dateTimeOffset   DateTimeOffset FromUnixTimeSeconds 1000      DateTimeOffset to Unix time in seconds      long unixTimeStampInSeconds   dateTimeOffset ToUnixTimeSeconds       Unix time in milliseconds to UTC DateTimeOffset      DateTimeOffset dateTimeOffset   DateTimeOffset FromUnixTimeMilliseconds 1000000      DateTimeOffset to Unix time in milliseconds      long unixTimeStampInMilliseconds   dateTimeOffset ToUnixTimeMilliseconds        Note  These methods convert to and from a UTC DateTimeOffset  To get a DateTime representation simply use the DateTimeOffset UtcDateTime or DateTimeOffset LocalDateTime properties   DateTime dateTime   dateTimeOffset UtcDateTime

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public static class UnixTime               private static readonly DateTime Epoch   new DateTime 1970  1  1  0  0  0  0            public static DateTime UnixTimeToDateTime double unixTimeStamp                        return Epoch AddSeconds unixTimeStamp  ToUniversalTime                      you can call UnixTime UnixTimeToDateTime double datetime

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System DateTimeOffset Now ToUnixTimeSeconds

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DateTime to UNIX timestamp   public static double DateTimeToUnixTimestamp DateTime dateTime        return  TimeZoneInfo ConvertTimeToUtc dateTime  -             new DateTime 1970  1  1  0  0  0  0  System DateTimeKind Utc   TotalSeconds

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Unix time conversion is new in  NET Framework 4 6   You can now more easily convert date and time values to or from  NET Framework types and Unix time  This can be necessary  for example  when converting time values between a JavaScript client and  NET server  The following APIs have been added to the DateTimeOffset structure   static DateTimeOffset FromUnixTimeSeconds long seconds  static DateTimeOffset FromUnixTimeMilliseconds long milliseconds  long DateTimeOffset ToUnixTimeSeconds   long DateTimeOffset ToUnixTimeMilliseconds

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I found the right answer just by comparing the conversion to 1 1 1970 w o the local time adjustment   DateTime date   new DateTime 2011  4  1  12  0  0  0   DateTime epoch   new DateTime 1970  1  1  0  0  0  0   TimeSpan span    date - epoch   double unixTime  span TotalSeconds

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For  NET 4 6 and later   public static class UnixDateTime       public static DateTimeOffset FromUnixTimeSeconds long seconds                if  seconds  lt  -62135596800L    seconds  gt  253402300799L              throw new ArgumentOutOfRangeException  seconds   seconds                return new DateTimeOffset seconds   10000000L   621355968000000000L  TimeSpan Zero              public static DateTimeOffset FromUnixTimeMilliseconds long milliseconds                if  milliseconds  lt  -62135596800000L    milliseconds  gt  253402300799999L              throw new ArgumentOutOfRangeException  milliseconds   milliseconds                return new DateTimeOffset milliseconds   10000L   621355968000000000L  TimeSpan Zero              public static long ToUnixTimeSeconds this DateTimeOffset utcDateTime                return utcDateTime Ticks   10000000L - 62135596800L             public static long ToUnixTimeMilliseconds this DateTimeOffset utcDateTime                return utcDateTime Ticks   10000L - 62135596800000L              Test      public void UnixSeconds                 DateTime utcNow   DateTime UtcNow          DateTimeOffset utcNowOffset   new DateTimeOffset utcNow            long unixTimestampInSeconds   utcNowOffset ToUnixTimeSeconds             DateTimeOffset utcNowOffsetTest   UnixDateTime FromUnixTimeSeconds unixTimestampInSeconds            Assert AreEqual utcNowOffset Year  utcNowOffsetTest Year           Assert AreEqual utcNowOffset Month  utcNowOffsetTest Month           Assert AreEqual utcNowOffset Date  utcNowOffsetTest Date           Assert AreEqual utcNowOffset Hour  utcNowOffsetTest Hour           Assert AreEqual utcNowOffset Minute  utcNowOffsetTest Minute           Assert AreEqual utcNowOffset Second  utcNowOffsetTest Second               Test      public void UnixMilliseconds                 DateTime utcNow   DateTime UtcNow          DateTimeOffset utcNowOffset   new DateTimeOffset utcNow            long unixTimestampInMilliseconds   utcNowOffset ToUnixTimeMilliseconds             DateTimeOffset utcNowOffsetTest   UnixDateTime FromUnixTimeMilliseconds unixTimestampInMilliseconds            Assert AreEqual utcNowOffset Year  utcNowOffsetTest Year           Assert AreEqual utcNowOffset Month  utcNowOffsetTest Month           Assert AreEqual utcNowOffset Date  utcNowOffsetTest Date           Assert AreEqual utcNowOffset Hour  utcNowOffsetTest Hour           Assert AreEqual utcNowOffset Minute  utcNowOffsetTest Minute           Assert AreEqual utcNowOffset Second  utcNowOffsetTest Second           Assert AreEqual utcNowOffset Millisecond  utcNowOffsetTest Millisecond

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From Wikipedia      UTC does not change with a change of seasons  but local time or civil time may change if a time zone jurisdiction observes daylight saving time  summer time   For example  local time on the east coast of the United States is five hours behind UTC during winter  but four hours behind while daylight saving is observed there    So this is my code   TimeSpan span    DateTime UtcNow - new DateTime 1970  1  1  0  0  0  0 DateTimeKind Utc    double unixTime   span TotalSeconds

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For  NET 4 6 and later   public static class UnixDateTime       public static DateTimeOffset FromUnixTimeSeconds long seconds                if  seconds  lt  -62135596800L    seconds  gt  253402300799L              throw new ArgumentOutOfRangeException  seconds   seconds                return new DateTimeOffset seconds   10000000L   621355968000000000L  TimeSpan Zero              public static DateTimeOffset FromUnixTimeMilliseconds long milliseconds                if  milliseconds  lt  -62135596800000L    milliseconds  gt  253402300799999L              throw new ArgumentOutOfRangeException  milliseconds   milliseconds                return new DateTimeOffset milliseconds   10000L   621355968000000000L  TimeSpan Zero              public static long ToUnixTimeSeconds this DateTimeOffset utcDateTime                return utcDateTime Ticks   10000000L - 62135596800L             public static long ToUnixTimeMilliseconds this DateTimeOffset utcDateTime                return utcDateTime Ticks   10000L - 62135596800000L              Test      public void UnixSeconds                 DateTime utcNow   DateTime UtcNow          DateTimeOffset utcNowOffset   new DateTimeOffset utcNow            long unixTimestampInSeconds   utcNowOffset ToUnixTimeSeconds             DateTimeOffset utcNowOffsetTest   UnixDateTime FromUnixTimeSeconds unixTimestampInSeconds            Assert AreEqual utcNowOffset Year  utcNowOffsetTest Year           Assert AreEqual utcNowOffset Month  utcNowOffsetTest Month           Assert AreEqual utcNowOffset Date  utcNowOffsetTest Date           Assert AreEqual utcNowOffset Hour  utcNowOffsetTest Hour           Assert AreEqual utcNowOffset Minute  utcNowOffsetTest Minute           Assert AreEqual utcNowOffset Second  utcNowOffsetTest Second               Test      public void UnixMilliseconds                 DateTime utcNow   DateTime UtcNow          DateTimeOffset utcNowOffset   new DateTimeOffset utcNow            long unixTimestampInMilliseconds   utcNowOffset ToUnixTimeMilliseconds             DateTimeOffset utcNowOffsetTest   UnixDateTime FromUnixTimeMilliseconds unixTimestampInMilliseconds            Assert AreEqual utcNowOffset Year  utcNowOffsetTest Year           Assert AreEqual utcNowOffset Month  utcNowOffsetTest Month           Assert AreEqual utcNowOffset Date  utcNowOffsetTest Date           Assert AreEqual utcNowOffset Hour  utcNowOffsetTest Hour           Assert AreEqual utcNowOffset Minute  utcNowOffsetTest Minute           Assert AreEqual utcNowOffset Second  utcNowOffsetTest Second           Assert AreEqual utcNowOffset Millisecond  utcNowOffsetTest Millisecond

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From Wikipedia      UTC does not change with a change of seasons  but local time or civil time may change if a time zone jurisdiction observes daylight saving time  summer time   For example  local time on the east coast of the United States is five hours behind UTC during winter  but four hours behind while daylight saving is observed there    So this is my code   TimeSpan span    DateTime UtcNow - new DateTime 1970  1  1  0  0  0  0 DateTimeKind Utc    double unixTime   span TotalSeconds

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A Unix tick is 1 second  if I remember well   and a  NET tick is 100 nbsp nanoseconds    If you ve been encountering problems with nanoseconds  you might want to try using AddTick 10000000   value

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Written a simplest extension that works for us   If anyone looks for it     public static class DateTimeExtensions       public static DateTime FromUnixTimeStampToDateTime this string unixTimeStamp                 return DateTimeOffset FromUnixTimeSeconds long Parse unixTimeStamp   UtcDateTime

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You can use  DateTimeOffset  For example  I have DateTime object var dateTime1 DateTime Now   If I want convert the it to Unix time stamps  I can be achieve as follows var unixTimeSeconds  new DateTimeOffset dateTime1  ToUnixTimeSeconds    If you want convert unix timeStamp to normal DateTime  you can use this code piece  var dateTime2   DateTimeOffset FromUnixTimeSeconds unixTimeSeconds  LocalDateTime   or var dateTime2   DateTimeOffset FromUnixTimeSeconds unixTimeSeconds  UtcDateTime   For more information please visit this link   DateTimeOffset ToUnixTimeSeconds Method  DateTimeOffset FromUnixTimeSeconds

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From  net 4 6  you can do this   var dateTime   DateTimeOffset FromUnixTimeSeconds unixDateTime  DateTime

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Written a simplest extension that works for us   If anyone looks for it     public static class DateTimeExtensions       public static DateTime FromUnixTimeStampToDateTime this string unixTimeStamp                 return DateTimeOffset FromUnixTimeSeconds long Parse unixTimeStamp   UtcDateTime

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var dt   DateTime Now   var unixTime     DateTimeOffset dt  ToUnixTimeSeconds         1510396991  var dt   DateTimeOffset FromUnixTimeSeconds 1510396991         11 11 2017 10 43 11  00 00

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A Unix tick is 1 second  if I remember well   and a  NET tick is 100 nbsp nanoseconds    If you ve been encountering problems with nanoseconds  you might want to try using AddTick 10000000   value

User · Answer

Here s what you need   public static DateTime UnixTimeStampToDateTime  double unixTimeStamp            Unix timestamp is seconds past epoch     System DateTime dtDateTime   new DateTime 1970 1 1 0 0 0 0 System DateTimeKind Utc       dtDateTime   dtDateTime AddSeconds  unixTimeStamp   ToLocalTime        return dtDateTime      Or  for Java  which is different because the timestamp is in milliseconds  not seconds    public static DateTime JavaTimeStampToDateTime  double javaTimeStamp            Java timestamp is milliseconds past epoch     System DateTime dtDateTime   new DateTime 1970 1 1 0 0 0 0 System DateTimeKind Utc       dtDateTime   dtDateTime AddMilliseconds  javaTimeStamp   ToLocalTime        return dtDateTime

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var dt   DateTime Now   var unixTime     DateTimeOffset dt  ToUnixTimeSeconds         1510396991  var dt   DateTimeOffset FromUnixTimeSeconds 1510396991         11 11 2017 10 43 11  00 00

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Here s what you need   public static DateTime UnixTimeStampToDateTime  double unixTimeStamp            Unix timestamp is seconds past epoch     System DateTime dtDateTime   new DateTime 1970 1 1 0 0 0 0 System DateTimeKind Utc       dtDateTime   dtDateTime AddSeconds  unixTimeStamp   ToLocalTime        return dtDateTime      Or  for Java  which is different because the timestamp is in milliseconds  not seconds    public static DateTime JavaTimeStampToDateTime  double javaTimeStamp            Java timestamp is milliseconds past epoch     System DateTime dtDateTime   new DateTime 1970 1 1 0 0 0 0 System DateTimeKind Utc       dtDateTime   dtDateTime AddMilliseconds  javaTimeStamp   ToLocalTime        return dtDateTime

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DateTime unixEpoch   DateTime ParseExact  1970-01-01    yyyy-MM-dd   System Globalization CultureInfo InvariantCulture   DateTime convertedTime   unixEpoch AddMilliseconds unixTimeInMillisconds     Of course  one can make unixEpoch a global static  so it only needs to appear once in your project  and one can use AddSeconds if the UNIX time is in seconds   To go the other way   double unixTimeInMilliseconds   timeToConvert Subtract unixEpoch  TotalMilliseconds    Truncate to Int64 and or use TotalSeconds as needed

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Unix time conversion is new in  NET Framework 4 6   You can now more easily convert date and time values to or from  NET Framework types and Unix time  This can be necessary  for example  when converting time values between a JavaScript client and  NET server  The following APIs have been added to the DateTimeOffset structure   static DateTimeOffset FromUnixTimeSeconds long seconds  static DateTimeOffset FromUnixTimeMilliseconds long milliseconds  long DateTimeOffset ToUnixTimeSeconds   long DateTimeOffset ToUnixTimeMilliseconds

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I needed to convert a timeval struct  seconds  microseconds  containing UNIX time to DateTime without losing precision and haven t found an answer here so I thought I just might add mine   DateTime  epochTime   new DateTime 1970  1  1  0  0  0  DateTimeKind Utc   private DateTime UnixTimeToDateTime Timeval unixTime        return  epochTime AddTicks          unixTime Seconds   TimeSpan TicksPerSecond           unixTime Microseconds   TimeSpan TicksPerMillisecond 1000

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To supplement ScottCher s answer  I recently found myself in the annoying scenario of having both seconds and milliseconds UNIX timestamps arbitrarily mixed together in an input data set   The following code seems to handle this well   static readonly DateTime UnixEpoch   new DateTime 1970  1  1  0  0  0  0  DateTimeKind Utc   static readonly double MaxUnixSeconds    DateTime MaxValue - UnixEpoch  TotalSeconds   public static DateTime UnixTimeStampToDateTime double unixTimeStamp       return unixTimeStamp  gt  MaxUnixSeconds         UnixEpoch AddMilliseconds unixTimeStamp          UnixEpoch AddSeconds unixTimeStamp

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I needed to convert a timeval struct  seconds  microseconds  containing UNIX time to DateTime without losing precision and haven t found an answer here so I thought I just might add mine   DateTime  epochTime   new DateTime 1970  1  1  0  0  0  DateTimeKind Utc   private DateTime UnixTimeToDateTime Timeval unixTime        return  epochTime AddTicks          unixTime Seconds   TimeSpan TicksPerSecond           unixTime Microseconds   TimeSpan TicksPerMillisecond 1000

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The latest version of  NET  v4 6  has added built-in support for Unix time conversions  That includes both to and from Unix time represented by either seconds or milliseconds    Unix time in seconds to UTC DateTimeOffset      DateTimeOffset dateTimeOffset   DateTimeOffset FromUnixTimeSeconds 1000      DateTimeOffset to Unix time in seconds      long unixTimeStampInSeconds   dateTimeOffset ToUnixTimeSeconds       Unix time in milliseconds to UTC DateTimeOffset      DateTimeOffset dateTimeOffset   DateTimeOffset FromUnixTimeMilliseconds 1000000      DateTimeOffset to Unix time in milliseconds      long unixTimeStampInMilliseconds   dateTimeOffset ToUnixTimeMilliseconds        Note  These methods convert to and from a UTC DateTimeOffset  To get a DateTime representation simply use the DateTimeOffset UtcDateTime or DateTimeOffset LocalDateTime properties   DateTime dateTime   dateTimeOffset UtcDateTime

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From  net 4 6  you can do this   var dateTime   DateTimeOffset FromUnixTimeSeconds unixDateTime  DateTime

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Be careful  if you need precision higher than milliseconds    NET  v4 6  methods  e g  FromUnixTimeMilliseconds  don t provide this precision   AddSeconds and AddMilliseconds also cut off the microseconds in the double   These versions have high precision   Unix -  DateTime  public static DateTime UnixTimestampToDateTime double unixTime        DateTime unixStart   new DateTime 1970  1  1  0  0  0  0  System DateTimeKind Utc       long unixTimeStampInTicks    long   unixTime   TimeSpan TicksPerSecond       return new DateTime unixStart Ticks   unixTimeStampInTicks  System DateTimeKind Utc       DateTime -  Unix  public static double DateTimeToUnixTimestamp DateTime dateTime        DateTime unixStart   new DateTime 1970  1  1  0  0  0  0  System DateTimeKind Utc       long unixTimeStampInTicks    dateTime ToUniversalTime   - unixStart  Ticks      return  double  unixTimeStampInTicks   TimeSpan TicksPerSecond

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See IdentityModel EpochTimeExtensions  public static class EpochTimeExtensions            lt summary gt          Converts the given date value to epoch time           lt  summary gt      public static long ToEpochTime this DateTime dateTime                var date   dateTime ToUniversalTime            var ticks   date Ticks - new DateTime 1970  1  1  0  0  0  0  DateTimeKind Utc  Ticks          var ts   ticks   TimeSpan TicksPerSecond          return ts                  lt summary gt          Converts the given date value to epoch time           lt  summary gt      public static long ToEpochTime this DateTimeOffset dateTime                var date   dateTime ToUniversalTime            var ticks   date Ticks - new DateTimeOffset 1970  1  1  0  0  0  TimeSpan Zero  Ticks          var ts   ticks   TimeSpan TicksPerSecond          return ts                  lt summary gt          Converts the given epoch time to a  lt see cref  DateTime   gt  with  lt see cref  DateTimeKind Utc   gt  kind           lt  summary gt      public static DateTime ToDateTimeFromEpoch this long intDate                var timeInTicks   intDate   TimeSpan TicksPerSecond          return new DateTime 1970  1  1  0  0  0  0  DateTimeKind Utc  AddTicks timeInTicks                   lt summary gt          Converts the given epoch time to a UTC  lt see cref  DateTimeOffset   gt            lt  summary gt      public static DateTimeOffset ToDateTimeOffsetFromEpoch this long intDate                var timeInTicks   intDate   TimeSpan TicksPerSecond          return new DateTimeOffset 1970  1  1  0  0  0  TimeSpan Zero  AddTicks timeInTicks

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public static class UnixTime               private static readonly DateTime Epoch   new DateTime 1970  1  1  0  0  0  0            public static DateTime UnixTimeToDateTime double unixTimeStamp                        return Epoch AddSeconds unixTimeStamp  ToUniversalTime                      you can call UnixTime UnixTimeToDateTime double datetime

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Here s what you need   public static DateTime UnixTimeStampToDateTime  double unixTimeStamp            Unix timestamp is seconds past epoch     System DateTime dtDateTime   new DateTime 1970 1 1 0 0 0 0 System DateTimeKind Utc       dtDateTime   dtDateTime AddSeconds  unixTimeStamp   ToLocalTime        return dtDateTime      Or  for Java  which is different because the timestamp is in milliseconds  not seconds    public static DateTime JavaTimeStampToDateTime  double javaTimeStamp            Java timestamp is milliseconds past epoch     System DateTime dtDateTime   new DateTime 1970 1 1 0 0 0 0 System DateTimeKind Utc       dtDateTime   dtDateTime AddMilliseconds  javaTimeStamp   ToLocalTime        return dtDateTime

User · Answer

DateTime unixEpoch   DateTime ParseExact  1970-01-01    yyyy-MM-dd   System Globalization CultureInfo InvariantCulture   DateTime convertedTime   unixEpoch AddMilliseconds unixTimeInMillisconds     Of course  one can make unixEpoch a global static  so it only needs to appear once in your project  and one can use AddSeconds if the UNIX time is in seconds   To go the other way   double unixTimeInMilliseconds   timeToConvert Subtract unixEpoch  TotalMilliseconds    Truncate to Int64 and or use TotalSeconds as needed

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To supplement ScottCher s answer  I recently found myself in the annoying scenario of having both seconds and milliseconds UNIX timestamps arbitrarily mixed together in an input data set   The following code seems to handle this well   static readonly DateTime UnixEpoch   new DateTime 1970  1  1  0  0  0  0  DateTimeKind Utc   static readonly double MaxUnixSeconds    DateTime MaxValue - UnixEpoch  TotalSeconds   public static DateTime UnixTimeStampToDateTime double unixTimeStamp       return unixTimeStamp  gt  MaxUnixSeconds         UnixEpoch AddMilliseconds unixTimeStamp          UnixEpoch AddSeconds unixTimeStamp

[c#] How can I convert a Unix timestamp to DateTime and vice versa?

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