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Perl 6Advent Calendar 2015

Day 9

速習Perl6の日付型

Last updated at Posted at 2015-12-09

こんばんは :whale2:

Perl 6 Advent Calendar 2015の9日目です。

今回はDateDateTimeクラスをざっとながめてみたいと思います。

Dateクラス

use v6;

# 今日
say my $today = Date.today; #=> 2015-12-09

# 翌日
say $today.succ;            #=> 2015-12-10

# 前日
say $today.pred;            #=> 2015-12-08

# 年/月/日
say $today.year;            #=> 2015
say $today.month;           #=> 12
say $today.day;             #=> 9

# うるう年?
say $today.is-leap-year;    #=> False

# 月の何日目?
say $today.day-of-month;    #=> 9

# 何曜日?
say $today.day-of-week;     #=> 3

# 年の何日目か
say $today.day-of-year;     #=> 343

# 年の何週目か
say $today.week.[1];        #=> 50

# この月何日まであるか
say $today.days-in-month;   #=> 31

# 2015年のクリスマス
say my $christmas = Date.new(2015, 12, 25); #=> 2015-12-25

# クリスマスまで何日
say $christmas - $today;    #=> 16

# 元旦(こういう指定もできます)
say my $newyear = Date.new(year => 2016, month => 1, day => 1); #=> 2016-01-01

DateTimeクラス

以下、何故かrb(Ruby)を指定してソース貼り付けしてます1

use v6;

# タイムゾーン '+09:00' 設定
my $*TZ = + 9 * 60 * 60;

# 元旦
put my $newyear = DateTime.new(
  year   => 2016,
  month  => 1,
  day    => 1,
  hour   => 21,
  minute => 15,
  second => 59,
  ).local; #=> 2016-01-02T06:15:59+09:00

# 2015年のクリスマス
put my $christmas = DateTime.new(
  :year(2015),
  :month(12),
  :day(25),
  ).local; #=> 2015-12-25T09:00:00+09:00


# 今日
put my $today = DateTime.new( time ).local; #=> 2015-12-09T22:35:24+09:00

# 今
put $today.now;      #=> 2015-12-09T22:35:24+09:00

# 時/分/秒
put $today.hour;     #=> 22
put $today.minute;   #=> 35
put $today.second;   #=> 24

# タイムゾーン確認 32400 ( = 9 * 60 * 60 )
put $today.timezone; #=> 32400

# 前日
say $today.earlier(days => 1);   #=> 2015-12-08T22:35:24+09:00

# 翌日
say $today.later(days => 1);     #=> 2015-12-10T22:35:24+09:00

# 翌月
say $today.later(months => 1);   #=> 2016-01-09T22:35:24+09:00

# タイムスタンプ
say $today.posix;                #=> 1449668124

# 標準時だと
say $today.utc;                  #=> 2015-12-09T13:35:24Z

(おまけ)演算子オーバーロード

use v6;

# 2015年のクリスマス
say my $christmas = DateTime.new(
  :year(2015),
  :month(12),
  :day(25),
  ).local; #=> 2015-12-25T09:00:00+09:00

# 今日
say my $today = DateTime.new( time ).local; #=> 2015-12-09T22:35:24+09:00


## 演算子オーバーロード
# DateTime型同士で引き算して日付を返せるように
multi infix:«-»(DateTime $a, DateTime $b --> Int) {
  DateTime.new(($a.posix - $b.posix).Int, :timezone($a.timezone), :formatter($a.formatter)).day;
}

# クリスマスまで何日
say $christmas - $today; #=> 16

おわりです。

参考と注釈

  1. QiitaのシンタックスハイライトがまだPerl6に対応してないみたいどうしよう

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