Java/日付
提供: 初心者エンジニアの簡易メモ
日付比較
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd hh:mm"); Date ddate = sdf.parse("2012-10-10 10:10"); Date today = new Date(); if (today.compareTo(ddate) == 1) { // ddateが昔 } else if (today.compareTo(ddate) == 0) { // ddateが今日と同じ } else if (today.compareTo(ddate) == -1) { // ddateが未来 }
年月日曜日取得
Calendar cal = Calendar.getInstance(); int year = cal.get(Calendar.YEAR); int month = cal.get(Calendar.MONTH) + 1; int day = cal.get(Calendar.DATE); int week = cal.get(Calendar.DAY_OF_WEEK); int h = cal.get(now.HOUR_OF_DAY);//時を取得 int m = cal.get(now.MINUTE); //分を取得 int s = cal.get(now.SECOND); //秒を取得
hh:mm:ssから秒数取得
try { SimpleDateFormat sdf = new SimpleDateFormat("HH:mm:ss"); Date date = sdf.parse("01:02:03"); System.out.println("second=" + date.getSeconds()); System.out.println("min=" + date.getMinutes()); System.out.println("hour=" + date.getHours()); System.out.println("total sec=" + (date.getHours() * 3600 + date.getMinutes() * 60 + date.getSeconds()));
SimpleDateFormat sdf2 = new SimpleDateFormat("HH:mm:ss.SSS"); Date datems = sdf2.parse("01:02:03.123"); System.out.println("second=" + datems.getSeconds()); System.out.println("min=" + datems.getMinutes()); System.out.println("hour=" + datems.getHours()); System.out.println("total sec=" + (datems.getHours() * 3600 + datems.getMinutes() * 60 + datems.getSeconds())); } catch(ParseException e) { e.printStackTrace(); }
date.getHoursについて Calendar.get(Calendar.HOUR_OF_DAY) に置き換えられています。