Question

I’m trying to extract date from ticks.

Am I right that, a millisecond is 10000 ticks.
and a day is 864000000000 ticks and a month
is 26784000000000 and a year is 316224000000000.

but when I use these in computations, I get wrong date :(.

It could have been easy using Datetime parse but, for some reasons they say that I shouldn’t rely on it as it is rather slower.

Would appreciate your help. Thank you.

UPDATE:

//assume this for now 
    DateTime time = DateTime.Now;
char[] ashigakaricom= new char[] { 'yyyy','-','mm','-','dd','-','H','H',':','M','M',':','S','S',':','m','m','m' }; 
long ticks = time.Ticks;
 int n1 = (int)(ticks >> 32);
 int n2 = (int)ticks;
 if (n2 < 0) 
n1++; 

ticks = (((Math.BigMul(429497, n2) - (int)(Math.BigMul(1161359156, n2) >> 32) - Math.BigMul(1161359156, n1)) >> 32)) + Math.BigMul(n1, 429497); n1 = (int)(ticks >> 32); 
n2 = (int)ticks; 


if (n2 < 0) 
n1++; 

int q = n1 * 50 + ((50 * (n2 >> 16)) >> 16) - (int)(System.Math.BigMul(1244382467, n1) >> 32) - 1; 

int r = (int)(ticks - System.Math.BigMul(q, 86400000)); 

if (r > 86400000) 
r -= 86400000; 



//so on

Answer 1

I have several ideas on this:

• If you’re missing correct year — probably incorrect starting point for this ticks calculation was assumed. For C# it’s not beginning of Unix epoch (1st January 1970), but “beginning of days” (1st January 0001);
• Incorrect date, hour or minute — this may something to do with leap year.