import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.Locale;
 
public class Main {
	public static void main(String[] args) {
		String strStartDateTime = "2021-01-01 00:00:00";
		String strEndDateTime = "2021-01-01 10:00:00";
 
		DateTimeFormatter dtf = DateTimeFormatter.ofPattern("uuuu-MM-dd HH:mm:ss", Locale.ENGLISH);
 
		LocalDateTime ldtStart = LocalDateTime.parse(strStartDateTime, dtf);
		LocalDateTime ldtEnd = LocalDateTime.parse(strEndDateTime, dtf);
 
		for (LocalDateTime ldt = ldtStart; !ldt.isAfter(ldtEnd); ldt = ldt.plusHours(1)) {
			// System.out.println(ldt);
 
			// Formatted
			System.out.println(ldt.format(dtf));
 
			// ...Your logic
		}
	}
}

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