How to convert datetime to timestamp using C NET ignoring current timezone

Question

How do I convert datetime to timestamp using C   NET  ignoring the current timezone    I am using the below code   private long ConvertToTimestamp DateTime value        long epoch    value ToUniversalTime   Ticks - 621355968000000000    10000000      return epoch      But it returns the timestamp value according to the current time zone  amp  and I need the result without using the current timezone

User · Answer

Find timestamp from DateTime   private long ConvertToTimestamp DateTime value        TimeZoneInfo NYTimeZone   TimeZoneInfo FindSystemTimeZoneById  Eastern Standard Time        DateTime NyTime   TimeZoneInfo ConvertTime value  NYTimeZone       TimeZone localZone   TimeZone CurrentTimeZone      System Globalization DaylightTime dst   localZone GetDaylightChanges NyTime Year       NyTime   NyTime AddHours -1       DateTime epoch   new DateTime 1970  1  1  0  0  0  0  ToLocalTime        TimeSpan span    NyTime - epoch       return  long Convert ToDouble span TotalSeconds

User · Answer

JonSkeet has a good answer but as an alternative if you wanted to keep the result more portable you could convert the date into an ISO 8601 format which could then be read into most other frameworks but this may fall outside your requirements   value ToUniversalTime   ToString  O

User · Answer

At the moment you re calling ToUniversalTime   - just get rid of that   private long ConvertToTimestamp DateTime value        long epoch    value Ticks - 621355968000000000    10000000      return epoch      Alternatively  and rather more readably IMO   private static readonly DateTime Epoch   new DateTime 1970  1  1  0  0  0  DateTimeKind Utc        private static long ConvertToTimestamp DateTime value        TimeSpan elapsedTime   value - Epoch      return  long  elapsedTime TotalSeconds      EDIT  As noted in the comments  the Kind of the DateTime you pass in isn t taken into account when you perform subtraction  You should really pass in a value with a Kind of Utc for this to work  Unfortunately  DateTime is a bit broken in this respect - see my blog post  a rant about DateTime  for more details   You might want to use my Noda Time date time API instead which makes everything rather clearer  IMO

User · Answer

I m not exactly sure what it is that you want  Do you want a TimeStamp  Then you can do something simple like   TimeStamp ts   TimeStamp FromTicks value ToUniversalTime   Ticks     Since you named a variable epoch  do you want the Unix time equivalent of your date   DateTime unixStart   DateTime SpecifyKind new DateTime 1970  1  1   DateTimeKind Utc   long epoch    long Math Floor  value ToUniversalTime   - unixStart  TotalSeconds

[c#] How to convert datetime to timestamp using C#/.NET (ignoring current timezone)

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