The personal web site of Rick Koshko (married name Rick Wiegmann Koshko).
To email me, click here for the email form.
I currently use these social networks: LinkedIn, Twitter, Facebook.
My compendium of links to useful, interesting, and cool web sites.



Day-of-the-week formula
Day-of-week calculator
Possible dates for day, month, and year
Possible months for a day, date, and year
Possible years for a day, month, and date
Days between dates
Easter date calculator
400-year perpetual calendar
Gregorian Calendar Lookup
Julian Day number calculator

To contact me
Click here for the email form.


Calendar 1
January
SMTWTFS
1234567
891011121314
15161718192021
22232425262728
293031 
 
February
SMTWTFS
1234
567891011
12131415161718
19202122232425
262728 
 
March
SMTWTFS
1234
567891011
12131415161718
19202122232425
262728293031 
 
April
SMTWTFS
 1
2345678
9101112131415
16171819202122
23242526272829
30 
May
SMTWTFS
 123456
78910111213
14151617181920
21222324252627
28293031 
 
June
SMTWTFS
 123
45678910
11121314151617
18192021222324
252627282930 
 
July
SMTWTFS
 1
2345678
9101112131415
16171819202122
23242526272829
3031 
August
SMTWTFS
12345
6789101112
13141516171819
20212223242526
2728293031
 
September
SMTWTFS
 12
3456789
10111213141516
17181920212223
24252627282930
 
October
SMTWTFS
1234567
891011121314
15161718192021
22232425262728
293031 
 
November
SMTWTFS
1234
567891011
12131415161718
19202122232425
2627282930 
 
December
SMTWTFS
 12
3456789
10111213141516
17181920212223
24252627282930
31