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, Google Plus.



Day-of-the-week formula
Day-of-week calculator
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.


Calendars are cool! Well, this is another one of those things I'm into that either you're into or you're not.