/
dateseq.go
76 lines (68 loc) · 1.38 KB
/
dateseq.go
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// Copyright 2013 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Dateseq prints a sequence of dates.
//
// dateseq start end
//
// Dateseq prints dates from start to end, in the same format as the arguments.
// Accepted formats are:
//
// yyyy-mm-dd
// yyyy/mm/dd
// mm/dd/yyyy
// mm/dd
//
// Example
//
// dateseq 2013-09-13 2013-10-05
//
package main
import (
"flag"
"fmt"
"log"
"os"
"strings"
"time"
)
var formats = []string{
"2006-01-02",
"2006/01/02",
"01/02/2006",
"01/02",
}
const format = "2006-01-02"
func usage() {
fmt.Fprintf(os.Stderr, "usage: dateseq start end\n\n")
fmt.Fprintf(os.Stderr, "start and end must use the same date format, one of:\n")
for _, format := range formats {
format = strings.Replace(format, "2006", "yyyy", -1)
format = strings.Replace(format, "01", "mm", -1)
format = strings.Replace(format, "02", "dd", -1)
fmt.Fprintf(os.Stderr, "\t%s\n", format)
}
os.Exit(2)
}
func main() {
log.SetFlags(0)
flag.Usage = usage
flag.Parse()
args := flag.Args()
if len(args) != 2 {
usage()
}
for _, f := range formats {
lo, err1 := time.Parse(f, args[0])
hi, err2 := time.Parse(f, args[1])
if err1 != nil || err2 != nil {
continue
}
for !lo.After(hi) {
fmt.Println(lo.Format(format))
lo = lo.AddDate(0, 0, 1)
}
return
}
usage()
}