// A month has five full weekends when it has 31 days,
// and the 1st day of the month is a Friday.
package main
import (
"fmt"
"time"
)
// ------------------------------------------------------------
// Month names as a single reusable constant
// ------------------------------------------------------------
var monthNames = [12]string{
"January", "February", "March", "April", "May", "June",
"July", "August", "September", "October", "November", "December",
}
// ------------------------------------------------------------
// Function: returns true if a month has 5 full weekends
// ------------------------------------------------------------
func hasFiveFullWeekends(year int, month time.Month) bool {
firstDay := time.Date(year, month, 1, 0, 0, 0, 0, time.UTC)
daysInMonth := firstDay.AddDate(0, 1, -1).Day()
weekday := firstDay.Weekday() // Sunday=0 ... Friday=5 ... Saturday=6
return daysInMonth == 31 && weekday == time.Friday
}
// ------------------------------------------------------------
// Main program
// ------------------------------------------------------------
func main() {
yValue := 2026
for m := time.January; m <= time.December; m++ {
if hasFiveFullWeekends(yValue, m) {
fmt.Printf("%s %d has five full weekends.\n",
monthNames[m-1], yValue)
}
}
}
/*
run:
May 2026 has five full weekends.
*/
