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package com.cedarsoftware.util;
import java.time.Instant;
import java.time.ZoneId;
import java.time.ZoneOffset;
import java.time.ZonedDateTime;
import java.util.Date;
import java.util.Map;
import java.util.TimeZone;
import java.util.concurrent.ConcurrentHashMap;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* Utility for parsing String dates with optional times, especially when the input String formats
* may be inconsistent. This will parse the following formats:
*
* 12-31-2023, 12/31/2023, 12.31.2023 mm is 1-12 or 01-12, dd is 1-31 or 01-31, and yyyy can be 0000 to 9999.
*
* 2023-12-31, 2023/12/31, 2023.12.31 mm is 1-12 or 01-12, dd is 1-31 or 01-31, and yyyy can be 0000 to 9999.
*
* January 6th, 2024 Month (3-4 digit abbreviation or full English name), white-space and optional comma,
* day of month (1-31) with optional suffixes 1st, 3rd, 22nd, whitespace and
* optional comma, and yyyy (0000-9999)
*
* 17th January 2024 day of month (1-31) with optional suffixes (e.g. 1st, 3rd, 22nd),
* Month (3-4 digit abbreviation or full English name), whites space and optional comma,
* and yyyy (0000-9999)
*
* 2024 January 31st 4 digit year, white space and optional comma, Month (3-4 digit abbreviation or full
* English name), white space and optional command, and day of month with optional
* suffixes (1st, 3rd, 22nd)
*
* Sat Jan 6 11:06:10 EST 2024 Unix/Linux style. Day of week (3-letter or full name), Month (3-4 digit or full
* English name), time hh:mm:ss, TimeZone (Java supported Timezone names), Year
*
* All dates can be followed by a Time, or the time can precede the Date. Whitespace or a single letter T must separate the
* date and the time for the non-Unix time formats. The Time formats supported:
*
* hh:mm hours (00-23), minutes (00-59). 24 hour format.
*
* hh:mm:ss hours (00-23), minutes (00-59), seconds (00-59). 24 hour format.
*
* hh:mm:ss.sssss hh:mm:ss and fractional seconds. Variable fractional seconds supported.
*
* hh:mm:offset -or- offset can be specified as +HH:mm, +HHmm, +HH, -HH:mm, -HHmm, -HH, or Z (GMT)
* hh:mm:ss.sss:offset which will match: "12:34", "12:34:56", "12:34.789", "12:34:56.789", "12:34+01:00",
* "12:34:56+1:00", "12:34-01", "12:34:56-1", "12:34Z", "12:34:56Z"
*
* hh:mm:zone -or- Zone can be specified as Z (Zulu = UTC), older short forms: GMT, EST, CST, MST,
* hh:mm:ss.sss:zone PST, IST, JST, BST etc. as well as the long forms: "America/New_York", "Asia/Saigon",
* etc. See ZoneId.getAvailableZoneIds().
*
* DateUtilities will parse Epoch-based integer-based value. It is considered number of milliseconds since Jan, 1970 GMT.
*
* "0" to A string of numeric digits will be parsed and returned as the number of milliseconds
* "999999999999999999" the Unix Epoch, January 1st, 1970 00:00:00 UTC.
*
* On all patterns above (excluding the numeric epoch millis), if a day-of-week (e.g. Thu, Sunday, etc.) is included
* (front, back, or between date and time), it will be ignored, allowing for even more formats than listed here.
* The day-of-week is not be used to influence the Date calculation.
*
* @author John DeRegnaucourt ([email protected])
*
* Copyright (c) Cedar Software LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
public final class DateUtilities {
private static final Pattern allDigits = Pattern.compile("^\\d+$");
private static final String days = "monday|mon|tuesday|tues|tue|wednesday|wed|thursday|thur|thu|friday|fri|saturday|sat|sunday|sun"; // longer before shorter matters
private static final String mos = "January|Jan|February|Feb|March|Mar|April|Apr|May|June|Jun|July|Jul|August|Aug|September|Sept|Sep|October|Oct|November|Nov|December|Dec";
private static final String yr = "[+-]?\\d{4,5}\\b";
private static final String d1or2 = "\\d{1,2}";
private static final String d2 = "\\d{2}";
private static final String ord = "st|nd|rd|th";
private static final String sep = "[./-]";
private static final String ws = "\\s+";
private static final String wsOp = "\\s*";
private static final String wsOrComma = "[ ,]+";
private static final String tzUnix = "[A-Z]{1,3}";
private static final String tz_Hh_MM = "[+-]\\d{1,2}:\\d{2}";
private static final String tz_Hh_MM_SS = "[+-]\\d{1,2}:\\d{2}:\\d{2}";
private static final String tz_HHMM = "[+-]\\d{4}";
private static final String tz_Hh = "[+-]\\d{1,2}";
private static final String tzNamed = wsOp + "\\[?[A-Za-z][A-Za-z0-9~\\/._+-]+]?";
private static final String nano = "\\.\\d+";
// Patterns defined in BNF influenced style using above named elements
private static final Pattern isoDatePattern = Pattern.compile( // Regex's using | (OR)
"(" + yr + ")(" + sep + ")(" + d1or2 + ")" + "\\2" + "(" + d1or2 + ")|" + // 2024/01/21 (yyyy/mm/dd -or- yyyy-mm-dd -or- yyyy.mm.dd) [optional time, optional day of week] \2 references 1st separator (ensures both same)
"(" + d1or2 + ")(" + sep + ")(" + d1or2 + ")" + "\\6(" + yr + ")"); // 01/21/2024 (mm/dd/yyyy -or- mm-dd-yyyy -or- mm.dd.yyyy) [optional time, optional day of week] \6 references 2nd 1st separator (ensures both same)
private static final Pattern alphaMonthPattern = Pattern.compile(
"\\b(" + mos + ")\\b" + wsOrComma + "(" + d1or2 + ")(" + ord + ")?" + wsOrComma + "(" + yr + ")|" + // Jan 21st, 2024 (comma optional between all, day of week optional, time optional, ordinal text optional [st, nd, rd, th])
"(" + d1or2 + ")(" + ord + ")?" + wsOrComma + "\\b(" + mos + ")\\b" + wsOrComma + "(" + yr + ")|" + // 21st Jan, 2024 (ditto)
"(" + yr + ")" + wsOrComma + "\\b(" + mos + "\\b)" + wsOrComma + "(" + d1or2 + ")(" + ord + ")?", // 2024 Jan 21st (ditto)
Pattern.CASE_INSENSITIVE);
private static final Pattern unixDateTimePattern = Pattern.compile(
"\\b(" + days + ")\\b" + ws + "\\b(" + mos + ")\\b" + ws + "(" + d1or2 + ")" + ws + "(" + d2 + ":" + d2 + ":" + d2 + ")" + wsOp + "(" + tzUnix + ")?" + wsOp + "(" + yr + ")",
Pattern.CASE_INSENSITIVE);
private static final Pattern timePattern = Pattern.compile(
"(" + d2 + "):(" + d2 + ")(?::(" + d2 + ")(" + nano + ")?)?(" + tz_Hh_MM_SS + "|" + tz_Hh_MM + "|" + tz_HHMM + "|" + tz_Hh + "|Z)?(" + tzNamed + ")?",
Pattern.CASE_INSENSITIVE);
private static final Pattern dayPattern = Pattern.compile("\\b(" + days + ")\\b", Pattern.CASE_INSENSITIVE);
private static final Map months = new ConcurrentHashMap<>();
static {
// Month name to number map
months.put("jan", 1);
months.put("january", 1);
months.put("feb", 2);
months.put("february", 2);
months.put("mar", 3);
months.put("march", 3);
months.put("apr", 4);
months.put("april", 4);
months.put("may", 5);
months.put("jun", 6);
months.put("june", 6);
months.put("jul", 7);
months.put("july", 7);
months.put("aug", 8);
months.put("august", 8);
months.put("sep", 9);
months.put("sept", 9);
months.put("september", 9);
months.put("oct", 10);
months.put("october", 10);
months.put("nov", 11);
months.put("november", 11);
months.put("dec", 12);
months.put("december", 12);
}
private DateUtilities() {
}
/**
* Original API. If the date-time given does not include a timezone offset or name, then ZoneId.systemDefault()
* will be used. We recommend using parseDate(String, ZoneId, boolean) version, so you can control the default
* timezone used when one is not specified.
* @param dateStr String containing a date. If there is excess content, it will throw an IllegalArgumentException.
* @return Date instance that represents the passed in date. See comments at top of class for supported
* formats. This API is intended to be super flexible in terms of what it can parse. If a null or empty String is
* passed in, null will be returned.
*/
public static Date parseDate(String dateStr) {
if (StringUtilities.isEmpty(dateStr)) {
return null;
}
Instant instant;
ZonedDateTime dateTime = parseDate(dateStr, ZoneId.systemDefault(), true);
instant = Instant.from(dateTime);
return Date.from(instant);
}
/**
* Main API. Retrieve date-time from passed in String. The boolean ensureDateTimeAlone, if set true, ensures that
* no other non-date content existed in the String.
* @param dateStr String containing a date. See DateUtilities class Javadoc for all the supported formats.
* @param defaultZoneId ZoneId to use if no timezone offset or name is given. Cannot be null.
* @param ensureDateTimeAlone If true, if there is excess non-Date content, it will throw an IllegalArgument exception.
* @return ZonedDateTime instance converted from the passed in date String. See comments at top of class for supported
* formats. This API is intended to be super flexible in terms of what it can parse. If a null or empty String is
* passed in, null will be returned.
*/
public static ZonedDateTime parseDate(String dateStr, ZoneId defaultZoneId, boolean ensureDateTimeAlone) {
dateStr = StringUtilities.trimToNull(dateStr);
if (dateStr == null) {
return null;
}
Convention.throwIfNull(defaultZoneId, "ZoneId cannot be null. Use ZoneId.of(\"America/New_York\"), ZoneId.systemDefault(), etc.");
if (allDigits.matcher(dateStr).matches()) {
return Instant.ofEpochMilli(Long.parseLong(dateStr)).atZone(defaultZoneId);
}
String year, day, remains, tz = null;
int month;
// Determine which date pattern to use
Matcher matcher = isoDatePattern.matcher(dateStr);
String remnant = matcher.replaceFirst("");
if (remnant.length() < dateStr.length()) {
if (matcher.group(1) != null) {
year = matcher.group(1);
month = Integer.parseInt(matcher.group(3));
day = matcher.group(4);
} else {
year = matcher.group(8);
month = Integer.parseInt(matcher.group(5));
day = matcher.group(7);
}
remains = remnant;
} else {
matcher = alphaMonthPattern.matcher(dateStr);
remnant = matcher.replaceFirst("");
if (remnant.length() < dateStr.length()) {
String mon;
if (matcher.group(1) != null) {
mon = matcher.group(1);
day = matcher.group(2);
year = matcher.group(4);
remains = remnant;
} else if (matcher.group(7) != null) {
mon = matcher.group(7);
day = matcher.group(5);
year = matcher.group(8);
remains = remnant;
} else {
year = matcher.group(9);
mon = matcher.group(10);
day = matcher.group(11);
remains = remnant;
}
month = months.get(mon.trim().toLowerCase());
} else {
matcher = unixDateTimePattern.matcher(dateStr);
if (matcher.replaceFirst("").length() == dateStr.length()) {
throw new IllegalArgumentException("Unable to parse: " + dateStr + " as a date-time");
}
year = matcher.group(6);
String mon = matcher.group(2);
month = months.get(mon.trim().toLowerCase());
day = matcher.group(3);
tz = matcher.group(5);
remains = matcher.group(4); // leave optional time portion remaining
}
}
// For the remaining String, match the time portion (which could have appeared ahead of the date portion)
String hour = null, min = null, sec = "00", fracSec = "0";
remains = remains.trim();
matcher = timePattern.matcher(remains);
remnant = matcher.replaceFirst("");
if (remnant.length() < remains.length()) {
hour = matcher.group(1);
min = matcher.group(2);
if (matcher.group(3) != null) {
sec = matcher.group(3);
}
if (matcher.group(4) != null) {
fracSec = "0" + matcher.group(4);
}
if (matcher.group(5) != null) {
tz = matcher.group(5).trim();
}
if (matcher.group(6) != null) {
// to make round trip of ZonedDateTime equivalent we need to use the original Zone as ZoneId
// ZoneId is a much broader definition handling multiple possible dates, and we want this to
// be equivalent to the original zone that was used if one was present.
tz = stripBrackets(matcher.group(6).trim());
}
}
if (ensureDateTimeAlone) {
verifyNoGarbageLeft(remnant);
}
ZoneId zoneId = StringUtilities.isEmpty(tz) ? defaultZoneId : getTimeZone(tz);
ZonedDateTime dateTime = getDate(dateStr, zoneId, year, month, day, hour, min, sec, fracSec);
return dateTime;
}
private static ZonedDateTime getDate(String dateStr,
ZoneId zoneId,
String year,
int month,
String day,
String hour,
String min,
String sec,
String fracSec) {
// Build Calendar from date, time, and timezone components, and retrieve Date instance from Calendar.
int y = Integer.parseInt(year);
int d = Integer.parseInt(day);
if (month < 1 || month > 12) {
throw new IllegalArgumentException("Month must be between 1 and 12 inclusive, date: " + dateStr);
}
if (d < 1 || d > 31) {
throw new IllegalArgumentException("Day must be between 1 and 31 inclusive, date: " + dateStr);
}
if (hour == null) { // no [valid] time portion
return ZonedDateTime.of(y, month, d, 0, 0, 0, 0, zoneId);
} else {
// Regex prevents these from ever failing to parse.
int h = Integer.parseInt(hour);
int mn = Integer.parseInt(min);
int s = Integer.parseInt(sec);
long nanoOfSec = convertFractionToNanos(fracSec);
if (h > 23) {
throw new IllegalArgumentException("Hour must be between 0 and 23 inclusive, time: " + dateStr);
}
if (mn > 59) {
throw new IllegalArgumentException("Minute must be between 0 and 59 inclusive, time: " + dateStr);
}
if (s > 59) {
throw new IllegalArgumentException("Second must be between 0 and 59 inclusive, time: " + dateStr);
}
return ZonedDateTime.of(y, month, d, h, mn, s, (int) nanoOfSec, zoneId);
}
}
private static long convertFractionToNanos(String fracSec) {
double fractionalSecond = Double.parseDouble(fracSec);
return (long) (fractionalSecond * 1_000_000_000);
}
private static ZoneId getTimeZone(String tz) {
if (tz != null) {
if (tz.startsWith("-") || tz.startsWith("+")) {
ZoneOffset offset = ZoneOffset.of(tz);
return ZoneId.ofOffset("GMT", offset);
} else {
try {
return ZoneId.of(tz);
} catch (Exception e) {
TimeZone timeZone = TimeZone.getTimeZone(tz);
if (timeZone.getRawOffset() == 0) {
throw e;
}
return timeZone.toZoneId();
}
}
}
return ZoneId.systemDefault();
}
private static void verifyNoGarbageLeft(String remnant) {
// Clear out day of week (mon, tue, wed, ...)
if (StringUtilities.length(remnant) > 0) {
Matcher dayMatcher = dayPattern.matcher(remnant);
remnant = dayMatcher.replaceFirst("").trim();
}
// Verify that nothing, "T" or "," is all that remains
if (StringUtilities.length(remnant) > 0) {
remnant = remnant.replaceAll("T|,", "").trim();
if (!remnant.isEmpty()) {
throw new IllegalArgumentException("Issue parsing date-time, other characters present: " + remnant);
}
}
}
private static String stripBrackets(String input) {
if (input == null || input.isEmpty()) {
return input;
}
return input.replaceAll("^\\[|\\]$", "");
}
}
