使用 java.text.SimpleDateFormat 用可能的个位数月/日/小时解析日期
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Parse date with possible single-digit month/day/hour using java.text.SimpleDateFormat
提问by ewall
On a project with Talend Open Studio (an Open Source code-generating ETL tool), I am getting errors parsing incoming date strings like "3/14/1967 0:00:00" (note the single-digit month).
在使用 Talend Open Studio（一种开源代码生成 ETL 工具）的项目中，我在解析传入日期字符串时遇到错误，例如“3/14/1967 0:00:00”（注意单位数月份）。
Digging into thecode, I can see it is using java.text.SimpleDateFormat. So the date pattern string I expect I need to use is "d-M-yyyy H:mm:ss"... but it keeps giving me errors like "Unparseable date: 3/14/1967 0:00:00".
深入研究代码，我可以看到它正在使用java.text.SimpleDateFormat。所以我希望我需要使用的日期模式字符串是“dM-yyyy H:mm:ss”……但它不断给我错误，比如“无法解析的日期：3/14/1967 0:00:00”。
I assume that SimpleDateFormat candeal with the single-or-double digit problem. Do I need a different date pattern?(Sure, I could do pre-processing to tweak the values before Java attempts to read the strings as Dates, but it shouldn't be necessary!)
我假设 SimpleDateFormat可以处理一位或两位数字的问题。我需要不同的日期模式吗？（当然，我可以在 Java 尝试将字符串读取为日期之前进行预处理以调整值，但这不是必需的！）
回答by Jon Skeet
Are you sure you actuallyneed to use d-M-yyyyrather than M/d/yyyy? I can see why it would have a problem with "3/14/1967"... what date did you expect that to be? Note that not only have you got "d" and "M" the wrong way round, but you've also specified "-" instead of "/" as the separator.
你确定你真的需要使用d-M-yyyy而不是M/d/yyyy？我明白为什么“3/14/1967”会出现问题……你预计那是哪一天？请注意，您不仅将“d”和“M”弄错了，而且还指定了“-”而不是“/”作为分隔符。
