The expressions January and January in English and Japanese do not change in any case.
However, in some languages such as Russian, Czech, Polish and Finnish, there is an inflection of "case inflection". https://ja.wikipedia.org/wiki/%E6%A0%BC%E5%A4%89%E5%8C%96
When expressing "○ month" in the following two ways, the expression method differs depending on the case inflection.
--When writing "○ month" alone --When writing "○ year ○ month" and "○ month ○ day" together with the year and day
Example. Finnish "January" (from http://whitebear0930.net/archives/5097)
| Date format | Expression |
|---|---|
| ○ Month | tammikuu |
| ○ year ○ month etc. | tammikuuta |
Android provides the ** "L" ** pattern as the date format of the month name to make this expression. If it is "L", the month name when it is used alone can be obtained, and if it is "M", the month name when it is not used alone can be obtained.
Example. Finnish "January"
| Date format | Expression |
|---|---|
| MMM | tammikuuta |
| MMMM | tammikuuta |
| LLL | tammi |
| LLLL | tammikuu |
Use alone & Use LLL if you want to get the abbreviated month name. Note that MMM cannot get the abbreviation. In languages that do not have case inflection (English, Japanese, etc.), L is treated the same as M.
Since there is a case inflection on the day of the week, "** c **" is prepared for the day of the week when used alone.
Example. Finnish "Wednesday"
| Date format | Expression |
|---|---|
| E, EE, EEE | ke |
| EEEE | keskiviikkona |
| EEEEE | K |
| EEEEEE | ke |
| c, cc, ccc | ke |
| cccc | keskiviikko |
| ccccc | K |
| cccccc | ke |
I often forget it, so it's an appendix. There are detailed examples of what characters are used and how many are used. I think the table in android.icu.text.SimpleDateFormat is easy to understand.
There are various classes that parse using date formats such as yyyy / MM / dd when displaying dates on Android.
Depending on the Android version, more can be used. From API 24 (Android 7.0), the android.icu.text package for ICU (International Components for Unicode) has been added.
Starting with API 26 (Android 8.0), the java.time package implemented in Java 8 has been added.
Qiita: Remember this for Java 8 date and time API for the time being http://qiita.com/tag1216/items/91a471b33f383981bfaa
Since java.text.SimpleDateFormat has different behavior between Java version and Android version, be careful about the difference in behavior from Java version when developing on Android.
Qiita: How to write SimpleDateFormat is different between Android and Java http://qiita.com/arai-wa/items/272c9a09386872b8c643
Looking at the reference in java.text.SimpleDateFormat, L and c are not listed in the date format pattern table, but they are correct. You can use it.
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