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Merge pull request #33 from keithc-ca/date
Avoid non-portable uses of date utility
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,94 @@ | ||
| /* | ||
| * =========================================================================== | ||
| * (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; | ||
|
|
||
| public class DateUtil { | ||
|
|
||
| public static void main(String... args) { | ||
| String date = ""; | ||
| String format = ""; | ||
|
|
||
| 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(); | ||
| } | ||
| } | ||
|
|
||
| LocalDateTime time = parseTime(date); | ||
|
|
||
| if (format.isEmpty()) { | ||
| System.out.println(time.toEpochSecond(ZoneOffset.UTC)); | ||
| } else { | ||
| DateTimeFormatter formatter = DateTimeFormatter.ofPattern(format, Locale.ROOT); | ||
|
|
||
| System.out.println(formatter.format(time)); | ||
| } | ||
| } | ||
|
|
||
| private static LocalDateTime parseTime(String text) { | ||
| if (text.isEmpty()) { | ||
| return LocalDateTime.now(ZoneOffset.UTC); | ||
| } | ||
|
|
||
| if (text.matches("\\d+")) { | ||
| return LocalDateTime.ofEpochSecond(Long.parseLong(text), 0, ZoneOffset.UTC); | ||
| } | ||
|
|
||
| try { | ||
| return LocalDateTime.ofInstant(Instant.parse(text), ZoneOffset.UTC); | ||
| } catch (DateTimeParseException e) { | ||
| // try next format | ||
| } | ||
|
|
||
| try { | ||
| return LocalDateTime.parse(text); | ||
| } catch (DateTimeParseException e) { | ||
| // try next format | ||
| } | ||
|
|
||
| try { | ||
| return LocalDate.parse(text).atStartOfDay(); | ||
| } catch (DateTimeParseException e) { | ||
| System.err.format("Cannot parse time: '%s'%n", text); | ||
| System.exit(1); | ||
| return null; | ||
| } | ||
| } | ||
|
|
||
| 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); | ||
| } | ||
|
|
||
| } |