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subaasubaa 

How can I find day value (eg. Sunday) from Datetime API

Hi,

 

How can I find day value (eg. Sunday) from Datetime API. Or do we have any other API to find this?

 

Regards,

SuBaa

mroarkmroark

You can use Sakamoto's algorithm (http://en.wikipedia.org/wiki/Calculating_the_day_of_the_week#Sakamoto.27s_algorithm)

 

From Wikipedia:

 

 int dow(int y, int m, int d) {
static int t[] = {0, 3, 2, 5, 0, 3, 5, 1, 4, 6, 2, 4}; 
y -= m < 3; 
return (y + y/4 - y/100 + y/400 + t[m-1] + d) % 7; 
}

In the above, y, m and d are, respectively the year (e.g., 1988), month (1-12) and day of the month (1-31).  The function returns 0 = Sunday, 1 = Monday, etc.