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A multi-format configuration library, toml module.
There is a newer version: 3.8.1
package com.electronwill.nightconfig.toml;

import com.electronwill.nightconfig.core.io.CharacterOutput;
import java.time.ZoneOffset;
import java.time.temporal.ChronoField;
import java.time.temporal.Temporal;

/**
 * @author TheElectronWill
 */
final class TemporalWriter {
	static void write(Temporal temporal, CharacterOutput output) {
		if (temporal.isSupported(ChronoField.YEAR)) {
			writeDate(temporal, output);
			if (temporal.isSupported(ChronoField.HOUR_OF_DAY)) {
				output.write('T');
				writeHour(temporal, output);
				if (temporal.isSupported(ChronoField.OFFSET_SECONDS)) {
					int offsetSeconds = temporal.get(ChronoField.OFFSET_SECONDS);
					ZoneOffset offset = ZoneOffset.ofTotalSeconds(offsetSeconds);
					output.write(offset.getId());
				}
			}
		} else if (temporal.isSupported(ChronoField.HOUR_OF_DAY)) {
			writeHour(temporal, output);
		}
	}

	private static void writeDate(Temporal temporal, CharacterOutput output) {
		int year = temporal.get(ChronoField.YEAR);
		int month = temporal.get(ChronoField.MONTH_OF_YEAR);
		int day = temporal.get(ChronoField.DAY_OF_MONTH);
		writePadded(year, 4, output);
		output.write('-');
		writePadded(month, 2, output);
		output.write('-');
		writePadded(day, 2, output);
	}

	private static void writeHour(Temporal temporal, CharacterOutput output) {
		int hours = temporal.get(ChronoField.HOUR_OF_DAY);
		int minutes = temporal.get(ChronoField.MINUTE_OF_HOUR);
		int seconds = temporal.get(ChronoField.SECOND_OF_MINUTE);
		writePadded(hours, 2, output);
		output.write(':');
		writePadded(minutes, 2, output);
		output.write(':');
		writePadded(seconds, 2, output);
		if (temporal.isSupported(ChronoField.NANO_OF_SECOND)) {
			int nanos = temporal.get(ChronoField.NANO_OF_SECOND);
			if (nanos != 0) {
				output.write('.');
				writePaddedAndTrimmed(nanos, 9, output);
			}
		} else if (temporal.isSupported(ChronoField.MILLI_OF_SECOND)) {
			int millis = temporal.get(ChronoField.MILLI_OF_SECOND);
			if (millis != 0) {
				output.write('.');
				writePaddedAndTrimmed(millis, 6, output);
			}
		}
	}

	private static void writePadded(int value, int numberOfDigits, CharacterOutput output) {
		String str = Integer.toString(value);
		for (int i = str.length(); i < numberOfDigits; i++) {
			output.write('0');
		}
		output.write(str);
	}

	private static void writePaddedAndTrimmed(int value, int numberOfDigits, CharacterOutput output) {
		String str = Integer.toString(value);
		int length = str.length();
		for (int i = length; i < numberOfDigits; i++) {
			output.write('0');
		}
		for (int i = length - 1; i >= 1; i--) {
			if (str.charAt(i) == '0') {
				length--;
			}
		}
		output.write(str, 0, length);
	}

	private TemporalWriter() {}
}