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package aQute.lib.date;
import java.time.Instant;
import java.time.LocalDate;
import java.time.LocalTime;
import java.time.ZoneId;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import java.time.format.DateTimeParseException;
import java.time.temporal.TemporalAccessor;
import java.time.temporal.TemporalQueries;
import java.util.Locale;
import java.util.TimeZone;
public class Dates {
public final static ZoneId UTC_ZONE_ID = ZoneId.of("UTC");
public static final TimeZone UTC_TIME_ZONE = TimeZone.getTimeZone("UTC");
public static final DateTimeFormatter RFC_7231_DATE_TIME = DateTimeFormatter
.ofPattern("EEE, dd MMM yyyy HH:mm:ss z", Locale.ENGLISH)
.withZone(ZoneId.of("GMT"));
// old Date toString format in default Locale
private static final DateTimeFormatter DATE_TOSTRING_DEFAULT_LOCALE = DateTimeFormatter
.ofPattern("EEE MMM dd HH:mm:ss z yyyy");
// old Date toString format
public static final DateTimeFormatter DATE_TOSTRING = DATE_TOSTRING_DEFAULT_LOCALE
.withLocale(Locale.ROOT);
private static final DateTimeFormatter[] DATE_TIME_FORMATTERS = new DateTimeFormatter[] {
// @formatter:off
DateTimeFormatter.ofPattern("yyyyMMddHHmmss.SSSZ", Locale.ROOT),
DateTimeFormatter.ISO_OFFSET_DATE.withLocale(Locale.ROOT),
DateTimeFormatter.ISO_LOCAL_DATE_TIME.withLocale(Locale.ROOT),
DateTimeFormatter.ISO_LOCAL_DATE.withLocale(Locale.ROOT),
DateTimeFormatter.ISO_OFFSET_DATE_TIME.withLocale(Locale.ROOT),
DateTimeFormatter.ISO_ORDINAL_DATE.withLocale(Locale.ROOT),
DateTimeFormatter.ISO_ZONED_DATE_TIME.withLocale(Locale.ROOT),
DateTimeFormatter.ISO_WEEK_DATE.withLocale(Locale.ROOT),
RFC_7231_DATE_TIME,
DateTimeFormatter.RFC_1123_DATE_TIME.withLocale(Locale.ROOT),
// old Date toString format
DATE_TOSTRING,
// old Date toString format in default Locale
DATE_TOSTRING_DEFAULT_LOCALE,
DateTimeFormatter.ofPattern("yyyy[-][/][ ]MM[-][/][ ]dd[ ][HH[:]mm[[:]ss][.SSS]][X]", Locale.ROOT),
DateTimeFormatter.ofPattern("dd[-][/][ ]MM[-][/][ ]yyyy[ HH[:]mm[[:]ss[.SSS]][X]", Locale.ROOT),
DateTimeFormatter.ofPattern("dd[-][/][ ]MMM[-][/][ ]yyyy[ HH[:]mm[[:]ss[.SSS]][X]", Locale.ROOT),
DateTimeFormatter.ofPattern("dd[-][/][ ]MMMM[-][/][ ]yyyy[ HH[:]mm[[:]ss[.SSS]][X]", Locale.US),
// Dont ask why these are needed, seems the DTF has a problem with a long
// row of digits. The optional characters [] dont work it seems
DateTimeFormatter.ofPattern("yyyyMMdd[X]", Locale.ROOT),
DateTimeFormatter.ofPattern("yyyyMMddHHmm[X]", Locale.ROOT),
DateTimeFormatter.ofPattern("yyyyMMdd[ ][/][-]HHmm[X]", Locale.ROOT),
DateTimeFormatter.ofPattern("yyyyMMddHHmmss[.SSS][X]", Locale.ROOT),
DateTimeFormatter.ofPattern("yyyyMMdd[ ][/][-]HHmmss[.SSS][X]", Locale.ROOT),
// @formatter:on
};
private Dates() {}
/**
* Return a ZonedDateTime that is set to the given datestring. This will try
* all standard DateTimeFormatter formats and a bunch more. It does not
* support formats where the day and month are ambiguous. It is either
* year-month-day or day-month-year.
*
* @param dateString a date formatted string
* @return a ZonedDateTime or null if the string cannot be interpreted as a
* date
*/
public static ZonedDateTime parse(String dateString) {
for (DateTimeFormatter df : DATE_TIME_FORMATTERS) {
try {
return toZonedDateTime(df.parse(dateString));
} catch (DateTimeParseException dte) {
// we ignore wrong formats
continue;
}
}
try {
long epochMilli = Long.parseLong(dateString);
return toZonedDateTime(epochMilli);
} catch (NumberFormatException e) {
return null;
}
}
/**
* Turn a TemporalAccessor into a ZonedDateTime using defaults for missing
* fields. See {@link #toZonedDateTime(TemporalAccessor)} for defaults.
*
* @param temporal the temporal to turn into {@link ZonedDateTime}
* @return a {@link ZonedDateTime}
*/
public static ZonedDateTime toZonedDateTime(TemporalAccessor temporal) {
if (temporal instanceof ZonedDateTime)
return (ZonedDateTime) temporal;
LocalDate date = temporal.query(TemporalQueries.localDate());
LocalTime time = temporal.query(TemporalQueries.localTime());
ZoneId zone = temporal.query(TemporalQueries.zone());
return toZonedDateTime(date, time, zone);
}
/**
* Return a new ZonedDateTime based on a local date, time, and zone. Each
* can be null.
*
* @param date the localdate, when null, the current date is used
* @param time the time, when null, 00:00:00.000 is used
* @param zone the time zone, when null, UTC is used
* @return a {@link ZonedDateTime}
*/
public static ZonedDateTime toZonedDateTime(LocalDate date, LocalTime time, ZoneId zone) {
if (date == null)
date = LocalDate.now();
if (time == null)
time = LocalTime.MIN;
if (zone == null)
zone = UTC_ZONE_ID;
return ZonedDateTime.of(date, time, zone);
}
/**
* Return a new ZonedDateTime based on a epoch milliseconds.
*
* @param epochMilli the number of milliseconds from 1970-01-01T00:00:00Z
* @return a {@link ZonedDateTime} using UTC time zone.
*/
public static ZonedDateTime toZonedDateTime(long epochMilli) {
return ZonedDateTime.ofInstant(Instant.ofEpochMilli(epochMilli), UTC_ZONE_ID);
}
/**
* Parse a string into epoch milliseconds.
*
* @param formatter The formatter to parse the string with.
* @param time Time string to parse into epoch milliseconds.
* @return The number of milliseconds from 1970-01-01T00:00:00Z.
*/
public static long parseMillis(DateTimeFormatter formatter, String time) {
TemporalAccessor temporal = formatter.parse(time);
return toZonedDateTime(temporal).toInstant()
.toEpochMilli();
}
/**
* Format epoch milliseconds to a string.
*
* @param formatter The formatter to format the epoch milliseconds with.
* @param epochMilli Number of milliseconds from 1970-01-01T00:00:00Z.
* @return Time string from the epoch milliseconds.
*/
public static String formatMillis(DateTimeFormatter formatter, long epochMilli) {
TemporalAccessor temporal = (formatter.getZone() == null) ? toZonedDateTime(epochMilli)
: Instant.ofEpochMilli(epochMilli);
return formatter.format(temporal);
}
}
