nim日付操作

概要

nimの日付・時刻操作をコツコツと。

以下メモ

今何時？

import times
proc `$`(t:TimeInfo) : string = format(t, "yyyy/MM/dd HH:mm:ss")
block:
  # 現在時刻を取得
  let now: TimeInfo = getLocalTime(getTime())
  # フォーマット化する
  let nowStr: string = format(now, "yyyy/MM/dd HH:mm:ss")
  echo "現在=",nowStr
  # 文字列をパースし、時刻型に変換
  let now2: TimeInfo = parse(nowStr,"yyyy/MM/dd HH:mm:ss")
  echo now == now2

(stdout)
現在=2016/06/05 09:42:19
true

日付情報

import times
proc `$`(t:TimeInfo) : string = format(t, "yyyy/MM/dd HH:mm:ss")
block:
  let time: TimeINfo = getLocalTime(getTime())
  echo "現在     =",time
  echo "second  =",time.second
  echo "minute  =",time.minute
  echo "hour    =",time.hour
  echo "monthday=",time.monthday
  echo "month   =",time.month
  echo "month   =",ord(time.month) + 1
  echo "year    =",time.year
  echo "weekday =",time.weekday
  echo "weekday =",ord(time.weekday) + 1
  echo "yearday =",time.yearday
  echo "isDST   =",time.isDST
  echo "tzname  =",time.tzname
  echo "timezone=",time.timezone

(stdout)
現在     =2016/06/05 09:42:20
second  =20
minute  =42
hour    =9
monthday=5
month   =June
month   =6
year    =2016
weekday =Sunday
weekday =7
yearday =156
isDST   =false
tzname  =JST
timezone=-32400

うるう年？

import times
proc `$`(t:TimeInfo) : string = format(t, "yyyy/MM/dd HH:mm:ss")
block:
  echo getTime().getGMTime.year.isLeapYear

(stdout)
true

日付の加算・減算

import times
proc `$`(t:TimeInfo) : string = format(t, "yyyy/MM/dd HH:mm:ss")
block:
  let today: TimeInfo = getLocalTime(getTime())
  # TimeIntervalを生成する
  let day: TimeInterval = initInterval(hours=24)
  echo "明日    =",today + day
  echo "昨日    =",today - day
  # TimeIntervalを利用しないで、Rubyっぽい？かんじで計算
  echo "１秒後  =",today + 1.seconds
  echo "１分後  =",today + 1.minutes
  echo "１時間後=",today + 1.hours
  echo "１週間後=",today + 7.days
  echo "１ヶ月後=",today + 1.months
  echo "１年後  =",today + 1.years

(stdout)
明日    =2016/06/06 09:42:21
昨日    =2016/06/04 09:42:21
１秒後  =2016/06/05 09:42:22
１分後  =2016/06/05 09:43:21
１時間後=2016/06/05 10:42:21
１週間後=2016/06/12 09:42:21
１ヶ月後=2016/07/05 09:42:21
１年後  =2017/06/05 09:42:21