added method 'isValidDateTimeFormatForConvertTimeZone' and 'isValidDateFormatForAstronomy'

Author: DaudAhmadJF

src/main/java/io/ipgeolocation/api/Strings.java

@@ -45,4 +45,124 @@ static Boolean isJsonString(String jsonString) {
             return false;
         }
     }
+
+    /**
+     * Validates a date and time string in the format "YYYY-MM-DD HH:mm:ss" or "YYYY-MM-DD HH:mm".
+     *
+     * @param dateTimeStr The date and time string to validate.
+     * @return {@code true} if the input string matches the specified formats and represents a valid date and time,
+     *         {@code false} otherwise.
+     */
+    public static boolean isValidDateTimeFormatForConvertTimeZone(String dateTimeStr) {
+        // Regular expression to match the format YYYY-MM-DD HH:mm:ss or YYYY-MM-DD HH:mm
+        String dateTimeRegex = "\\d{4}-\\d{2}-\\d{2} \\d{2}:\\d{2}(:\\d{2})?";
+
+        if (dateTimeStr.matches(dateTimeRegex)) {
+            String[] parts = dateTimeStr.split(" ");
+            String datePart = parts[0];
+            String timePart = parts[1];
+
+            String[] dateParts = datePart.split("-");
+            String[] timeParts = timePart.split(":");
+
+            // Check if all parts are valid integers
+            for (String part : dateParts) {
+                try {
+                    Integer.parseInt(part);
+                } catch (NumberFormatException e) {
+                    return false;
+                }
+            }
+            for (String part : timeParts) {
+                try {
+                    Integer.parseInt(part);
+                } catch (NumberFormatException e) {
+                    return false;
+                }
+            }
+
+            // Check if the date and time parts are within valid ranges
+            int year = Integer.parseInt(dateParts[0]);
+            int month = Integer.parseInt(dateParts[1]);
+            int day = Integer.parseInt(dateParts[2]);
+            int hour = Integer.parseInt(timeParts[0]);
+            int minute = Integer.parseInt(timeParts[1]);
+            int second = timeParts.length == 3 ? Integer.parseInt(timeParts[2]) : 0;
+
+            // Basic validation for year, month, and day
+            if (year < 0 || month < 1 || month > 12 || day < 1 || day > 31 ||
+                    hour < 0 || hour > 23 || minute < 0 || minute > 59 || second < 0 || second > 59) {
+                return false;
+            }
+
+            // Additional validation for month and day
+            if ((month == 4 || month == 6 || month == 9 || month == 11) && day > 30) {
+                return false;
+            }
+            if (month == 2) {
+                if (year % 4 == 0 && (year % 100 != 0 || year % 400 == 0)) {
+                    return day <= 29;
+                } else {
+                    return day <= 28;
+                }
+            }
+
+            return true;
+        }
+        return false;
+    }
+
+    /**
+     * Validates a date string in the format "YYYY-MM-DD".
+     *
+     * @param dateStr The date string to validate.
+     * @return {@code true} if the input string matches the specified format and represents a valid date,
+     *         {@code false} otherwise.
+     */
+    public static boolean isValidDateFormatForAstronomy(String dateStr) {
+        // Regular expression to match the format YYYY-MM-DD
+        String dateRegex = "\\d{4}-\\d{2}-\\d{2}";
+
+        if (dateStr.matches(dateRegex)) {
+            String[] dateParts = dateStr.split("-");
+
+            // Check if all parts are valid integers
+            for (String part : dateParts) {
+                try {
+                    Integer.parseInt(part);
+                } catch (NumberFormatException e) {
+                    return false;
+                }
+            }
+
+            // Check if the date parts are within valid ranges
+            int year = Integer.parseInt(dateParts[0]);
+            int month = Integer.parseInt(dateParts[1]);
+            int day = Integer.parseInt(dateParts[2]);
+
+            // Basic validation for year, month, and day
+            if (year < 0 || month < 1 || month > 12 || day < 1 || day > 31) {
+                return false;
+            }
+
+            // Additional validation for month and day
+            if ((month == 4 || month == 6 || month == 9 || month == 11) && day > 30) {
+                return false;
+            }
+            if (month == 2) {
+                if (year % 4 == 0 && (year % 100 != 0 || year % 400 == 0)) {
+                    if (day > 29) {
+                        return false;
+                    }
+                } else {
+                    if (day > 28) {
+                        return false;
+                    }
+                }
+            }
+
+            return true;
+        }
+        return false;
+    }
 }