java date-time formatting snippets

Author: Mcbencrafter

snippets/java/date-time/date-time-formatting-american.md

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+---
+title: Date time formatting american
+description: Formats a timestamp to a human-readable date-time string in the format "MM/dd/yyyy hh:mm:ss a"
+author: Mcbencrafter
+tags: java, date, time, date-time, formatting, american
+---
+
+```java
+import java.time.Instant;
+import java.time.ZoneId;
+import java.time.format.DateTimeFormatter;
+import java.util.concurrent.TimeUnit;
+
+public class DateTimeFormatterAmerican {
+
+    public static void main(String[] args) {
+        System.out.println(formatDateTimeAmerican(1735689599, TimeUnit.SECONDS)); // "12/31/2024 | 11:59:59 PM" for GMT+0000
+        System.out.println(formatDateTimeAmerican(1735689599, TimeUnit.SECONDS, ZoneId.of("GMT+0000"))); // "12/31/2024 | 11:59:59 PM"
+    }
+
+    // using the system default time zone
+    public static String formatDateTimeAmerican(long time, TimeUnit timeUnit) {
+        return formatDateTimeAmerican(time, timeUnit, ZoneId.systemDefault());
+    }
+    
+    public static String formatDateTimeAmerican(long time, TimeUnit timeUnit, ZoneId timeZone) {
+        return DateTimeFormatter.ofPattern("MM/dd/yyyy hh:mm:ss a")
+                .withZone(
+                    timeZone != null ? timeZone : ZoneId.systemDefault()
+                )
+                .format(Instant.ofEpochSecond(
+                    timeUnit.toSeconds(time)
+                ));
+    }
+}
+```

snippets/java/date-time/date-time-formatting-european.md

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+---
+title: Date time formatting european
+description: Formats a timestamp to a human-readable date-time string in the format "dd.MM.yyyy HH:mm:ss"
+author: Mcbencrafter
+tags: java, date, time, date-time, formatting, european
+---
+
+```java
+import java.time.Instant;
+import java.time.ZoneId;
+import java.time.format.DateTimeFormatter;
+import java.util.concurrent.TimeUnit;
+
+public class DateTimeFormatterEuropean {
+
+    public static void main(String[] args) {
+        System.out.println(formatDateTimeEuropean(1735689599, TimeUnit.SECONDS)); // "31.12.2024 | 23:59:59" for GMT+0000
+        System.out.println(formatDateTimeEuropean(1735689599, TimeUnit.SECONDS, ZoneId.of("GMT+0000"))); // "31.12.2024 | 23:59:59"
+    }
+
+    // using the system default time zone
+    public static String formatDateTimeEuropean(long time, TimeUnit timeUnit) {
+        return formatDateTimeEuropean(time, timeUnit, ZoneId.systemDefault());
+    }
+    
+    public static String formatDateTimeEuropean(long time, TimeUnit timeUnit, ZoneId timeZone) {
+        return DateTimeFormatter.ofPattern("dd.MM.yyyy HH:mm:ss")
+                .withZone(
+                    timeZone != null ? timeZone : ZoneId.systemDefault()
+                )
+                .format(Instant.ofEpochSecond(
+                        timeUnit.toSeconds(time)
+                ));
+    }
+}
+```