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Merge pull request #33 from keithc-ca/date
Avoid non-portable uses of date utility
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/* | ||
* =========================================================================== | ||
* (c) Copyright IBM Corp. 2022, 2022 All Rights Reserved | ||
* =========================================================================== | ||
* This code is free software; you can redistribute it and/or modify it | ||
* under the terms of the GNU General Public License version 2 only, as | ||
* published by the Free Software Foundation. | ||
* | ||
* IBM designates this particular file as subject to the "Classpath" exception | ||
* as provided by IBM in the LICENSE file that accompanied this code. | ||
* | ||
* This code is distributed in the hope that it will be useful, but WITHOUT | ||
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
* version 2 for more details (a copy is included in the LICENSE file that | ||
* accompanied this code). | ||
* | ||
* You should have received a copy of the GNU General Public License version | ||
* 2 along with this work; if not, see <http://www.gnu.org/licenses/>. | ||
* =========================================================================== | ||
*/ | ||
import java.time.Instant; | ||
import java.time.LocalDate; | ||
import java.time.LocalDateTime; | ||
import java.time.ZoneOffset; | ||
import java.time.format.DateTimeFormatter; | ||
import java.time.format.DateTimeParseException; | ||
import java.util.Locale; | ||
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public class DateUtil { | ||
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public static void main(String... args) { | ||
String date = ""; | ||
String format = ""; | ||
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for (String arg : args) { | ||
if (arg.startsWith("--date=")) { | ||
date = arg.substring(7).trim(); | ||
} else if (arg.startsWith("--format=")) { | ||
format = arg.substring(9).trim(); | ||
} else { | ||
showUsageAndExit(); | ||
} | ||
} | ||
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LocalDateTime time = parseTime(date); | ||
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if (format.isEmpty()) { | ||
System.out.println(time.toEpochSecond(ZoneOffset.UTC)); | ||
} else { | ||
DateTimeFormatter formatter = DateTimeFormatter.ofPattern(format, Locale.ROOT); | ||
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System.out.println(formatter.format(time)); | ||
} | ||
} | ||
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private static LocalDateTime parseTime(String text) { | ||
if (text.isEmpty()) { | ||
return LocalDateTime.now(ZoneOffset.UTC); | ||
} | ||
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if (text.matches("\\d+")) { | ||
return LocalDateTime.ofEpochSecond(Long.parseLong(text), 0, ZoneOffset.UTC); | ||
} | ||
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try { | ||
return LocalDateTime.ofInstant(Instant.parse(text), ZoneOffset.UTC); | ||
} catch (DateTimeParseException e) { | ||
// try next format | ||
} | ||
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try { | ||
return LocalDateTime.parse(text); | ||
} catch (DateTimeParseException e) { | ||
// try next format | ||
} | ||
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try { | ||
return LocalDate.parse(text).atStartOfDay(); | ||
} catch (DateTimeParseException e) { | ||
System.err.format("Cannot parse time: '%s'%n", text); | ||
System.exit(1); | ||
return null; | ||
} | ||
} | ||
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private static void showUsageAndExit() { | ||
System.err.println("Usage: DateUtil [options]"); | ||
System.err.println(" --date=<time> time in epoch seconds, or in iso-8601 or yyyy-MM-dd format"); | ||
System.err.println(" --format=<format> output format"); | ||
System.exit(1); | ||
} | ||
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} |