Convert UNIX timestamp to .NET DateTime ticks in unmanaged code (without using .NET)

Question

I need to "construct" .NET DateTime values in Python/C++.

How can I compute the number of ticks stored by DateTime starting from a UNIX timestamp?

A solution involving Win32 API calls it's ok (I believe FILETIME functions could help).

Roman · Accepted Answer · 2010-05-03 22:14:57Z

2

This would give you the number of ticks since that the Unix Epoc starts at (which is 621,355,968,000,000,000)

(new DateTime( 1970,1,1) - DateTime.MinValue).Ticks

This gives you ticks per second (which is 10,000,000)

TimeSpan.TicksPerSecond

Just math from there (may run into weirdness around leap seconds).

answered May 3, 2010 at 22:14

Roman

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6 Comments

AMissico Over a year ago

TimeSpan.TicksPerMillisecond Field -- The value of this constant is 10 thousand; that is, 10,000.

AMissico Over a year ago

TimeSpan.TicksPerSecond Field -- The value of this constant is 10 million; that is, 10,000,000.

AMissico Over a year ago

TimeSpan.TicksPerMinute Field -- The value of this constant is 600 million; that is, 600,000,000.

Roman Over a year ago

@amissico: That's great, but Unix time is number of seconds since since 1/1/1970, why would he need higher tick resolution (like TicksPerMillisecond)?

AMissico Over a year ago

At the time I was looking up this information. I just added it because I was updating my development notes, and figured I would save someone some time down the road.

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