Choice Problem: choose 5 days in a month, consecutive days are forbidden
24091
How many ways can $r$ nonconsecutive integers be chosen from the first $n$ integers?
62291
Number of days between 2 dates, excluding weekends
47475
Make SimpleDateFormat.parse() fail on invalid dates (e.g. month is greater than 12)
136449
Combinatorics problem on $20$ people, $12$ months, and distinguishable groups
158650
Is  "choose from one of four options" wrong?
155615
how to get the first and last days of a given month
94295
Pigeonhole-principle with two choices
53039
Resolve the error "An illegal choice has been detected..."
46574
Meaning of 'no earlier than X days after Y'
14505
Birthday-coverage problem
35640
Can't switch from Calendar month view to day
155247
Need to disable Days in Jquery-UI DatePicker
41953
Dropping n consecutive terms from a list periodically
58499
Creating a range of dates in Python
157903
how to create a data file with a column of date from day1 to dayN?
84479
How to add 7 days to current date while not going over available days of a month?
86990
The best way to get the first and last day of last month?