/**
 * The MIT License
 * Copyright (c) 2014-2016 Nick Guletskii
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package org.ng200.openolympus.util;

import java.time.chrono.IsoChronology;
import java.time.format.DateTimeFormatter;
import java.time.format.DateTimeFormatterBuilder;
import java.time.format.ResolverStyle;

public class DateUtils {
	public static final DateTimeFormatter ISO_OFFSET_DATE_TIME = new DateTimeFormatterBuilder()
			.parseCaseInsensitive()
			.append(DateTimeFormatter.ISO_LOCAL_DATE)
			.appendLiteral(' ')
			.append(DateTimeFormatter.ISO_LOCAL_TIME)
			.appendOffset("+HH", "Z")
			.toFormatter()
			.withChronology(IsoChronology.INSTANCE)
			.withResolverStyle(ResolverStyle.STRICT);
}

/**
 * The MIT License
 * Copyright (c) 2014-2016 Nick Guletskii
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package org.ng200.openolympus.util;

import java.time.OffsetDateTime;
import java.time.chrono.IsoChronology;
import java.time.format.DateTimeFormatter;
import java.time.format.DateTimeFormatterBuilder;
import java.time.format.ResolverStyle;

public class DateUtils {
	public static final DateTimeFormatter ISO_OFFSET_DATE_TIME = new DateTimeFormatterBuilder()
			.parseCaseInsensitive()
			.append(DateTimeFormatter.ISO_LOCAL_DATE)
			.appendLiteral(' ')
			.append(DateTimeFormatter.ISO_LOCAL_TIME)
			.appendOffset("+HH", "Z")
			.toFormatter()
			.withChronology(IsoChronology.INSTANCE)
			.withResolverStyle(ResolverStyle.STRICT);

	public static OffsetDateTime parse(String string) {
		return OffsetDateTime.parse(string, ISO_OFFSET_DATE_TIME);
	}
}

Add helper method for working with time