A simple commandline calendar in go

godays.go

package main

import (
	"fmt"
	"time"
)

func main() {
	//A simple application for printing out a calendar
	//Algorithm used(Hey I'm no good in algorithms just
	// wanted the job done)
	var (
		dw int //day of the week
		lm int //lenth of the month
		dm int //day of the month
		cm int //current month

	)
	weekd := [7]string{"mon", "Tues", "wed", "Thur", "Fri", "Sat", "Sun"}
	sm := make(map[string]int)    // standard length of a month
	if time.Now().Year()%4 == 0 { // gosh! rember leap year
		sm["February"] = 29
	} else {
		sm["February"] = 28
	}
	sm["January"] = 31
	sm["March"] = 31
	sm["April"] = 30
	sm["May"] = 31
	sm["June"] = 30
	sm["July"] = 31
	sm["August"] = 31
	sm["September"] = 30
	sm["October"] = 31
	sm["November"] = 30
	sm["Dcember"] = 31

	sd := make(map[string]int) //standard day of the week
	sd["Monday"] = 1
	sd["Tuesday"] = 2
	sd["Wednesday"] = 3
	sd["Thursday"] = 4
	sd["Friday"] = 5
	sd["Saturday"] = 6
	sd["Sunday"] = 7

	//creaate a new date object set to current year,this time
	//but on january
	d := time.Date(time.Now().Year(), 1, 1, time.Now().Hour(), time.Now().Minute(), time.Now().Second(), time.Now().Nanosecond(), time.UTC)
	//we are only interested in current month and the day of the week

	dw = sd[d.Weekday().String()]
	lm = sm[d.Month().String()]

	for cm = 1; cm <= 12; cm++ {
		fmt.Printf("Month--%s \n", d.Month().String())
		for _, v := range weekd {
			fmt.Printf("	%s", v)

		}

		fmt.Println()

		for i := 1; i < dw; i++ {
			fmt.Printf("	")
		}
		for dm = 1; dm <= lm; dm++ {
			if (dm+dw-1)%7 == 0 {
				fmt.Printf("	%d\n", dm)
			} else {
				fmt.Printf("	%d", dm)
			}

		}
		fmt.Println()
		d = d.AddDate(0, 1, 0)
		lm = sm[d.Month().String()]
		dw = sd[d.Weekday().String()]
	}
}