DayOfWeek

The DayOfWeek function computes the day of the week corresponding to a year, month, and day. The value is returned as a number 0 through 6 with Sunday being day 0.

Syntax

sDOW = DayOfWeek( nYear, nMonth, nDay )

where

nYear, nMonth, nDay are the components of the date (e.g., 2007, 4, and 23).

nDOW is the day of the week with values 0 through 6, beginning with Sunday = 0.

Example

The following script computes the day of the week and lists it in a nice format:

-- First, create a table contining the day names
DOW = { "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday" }

-- enter the year, month, and day to be evaluated
yr = 2009 ; mo = 1 ; day = 4

-- calculate the day of the week
nDay = DayOfWeek( yr, mo, day )	-- returns Sunday as 0

-- For printing the result, remember that Lua tables start at
-- index 1, but DayOfWeek() returns Sunday as 0, so we compensate
-- by fetching the day name from the table using index [nDay+1]
Printf("DOW for %04d/%02d/%02d = %d:%s\r\n", yr, mo, day, nDay, DOW[nDay+1] )