devextreme
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HTML5 JavaScript Component Suite for Responsive Web Development
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JavaScript
/**
* DevExtreme (esm/__internal/core/localization/ldml/date.format.js)
* Version: 25.2.3
* Build date: Fri Dec 12 2025
*
* Copyright (c) 2012 - 2025 Developer Express Inc. ALL RIGHTS RESERVED
* Read about DevExtreme licensing here: https://js.devexpress.com/Licensing/
*/
import numberLocalization from "../../../core/localization/number";
const ARABIC_COMMA = "\u060c";
const FORMAT_SEPARATORS = " .,:;/\\<>()-[]\u060c";
const AM_PM_PATTERN = ". m.";
const checkDigit = char => {
const code = char && numberLocalization.convertDigits(char, false).charCodeAt(0);
const zeroCode = numberLocalization.convertDigits("0", false).charCodeAt(0);
return zeroCode <= code && code < zeroCode + 10
};
const checkPatternContinue = (text, patterns, index, isDigit) => {
const char = text[index];
const nextChar = text[index + 1];
if (!isDigit) {
if ("." === char || " " === char && ". m." === text.slice(index - 1, index + 3)) {
return true
}
if ("-" === char && !checkDigit(nextChar)) {
return true
}
}
const isDigitChanged = isDigit && patterns.some((pattern => text[index] !== pattern[index]));
return !FORMAT_SEPARATORS.includes(char) && isDigit === checkDigit(char) && (!isDigit || isDigitChanged)
};
const getPatternStartIndex = (defaultPattern, index) => {
if (!checkDigit(defaultPattern[index])) {
while (index > 0 && !checkDigit(defaultPattern[index - 1]) && ("." === defaultPattern[index - 1] || !FORMAT_SEPARATORS.includes(defaultPattern[index - 1]))) {
index -= 1
}
}
return index
};
const getDifference = (defaultPattern, patterns, processedIndexes, isDigit) => {
let i = 0;
const result = [];
const patternsFilter = pattern => defaultPattern[i] !== pattern[i] && (void 0 === isDigit || checkDigit(defaultPattern[i]) === isDigit);
if (!Array.isArray(patterns)) {
patterns = [patterns]
}
for (i = 0; i < defaultPattern.length; i += 1) {
if (!processedIndexes.includes(i) && patterns.filter(patternsFilter).length) {
i = getPatternStartIndex(defaultPattern, i);
do {
isDigit = checkDigit(defaultPattern[i]);
if (!result.length && !isDigit && checkDigit(patterns[0][i])) {
break
}
result.push(i);
processedIndexes.unshift(i);
i += 1
} while (defaultPattern[i] && checkPatternContinue(defaultPattern, patterns, i, isDigit));
break
}
}
if (1 === result.length && ("0" === defaultPattern[processedIndexes[0] - 1] || "\u0660" === defaultPattern[processedIndexes[0] - 1])) {
processedIndexes.unshift(processedIndexes[0] - 1)
}
return result
};
const replaceCharsCore = (pattern, indexes, char, patternPositions) => {
const baseCharIndex = indexes[0];
const patternIndex = baseCharIndex < patternPositions.length ? patternPositions[baseCharIndex] : baseCharIndex;
indexes.forEach(((_, index) => {
pattern = pattern.substr(0, patternIndex + index) + (char.length > 1 ? char[index] : char) + pattern.substr(patternIndex + index + 1)
}));
if (1 === indexes.length) {
pattern = pattern.replace(`0${char}`, char + char);
pattern = pattern.replace(`\u0660${char}`, char + char)
}
return pattern
};
const replaceChars = (pattern, indexes, char, patternPositions) => {
let i;
let index;
let patternIndex;
if (!checkDigit(pattern[indexes[0]] || "0")) {
const letterCount = Math.max(indexes.length <= 3 ? 3 : 4, char.length);
while (indexes.length > letterCount) {
index = indexes.pop();
patternIndex = patternPositions[index];
patternPositions[index] = -1;
for (i = index + 1; i < patternPositions.length; i += 1) {
patternPositions[i] -= 1
}
pattern = pattern.substr(0, patternIndex) + pattern.substr(patternIndex + 1)
}
index = indexes[indexes.length - 1] + 1;
patternIndex = index < patternPositions.length ? patternPositions[index] : index;
while (indexes.length < letterCount) {
indexes.push(indexes[indexes.length - 1] + 1);
for (i = index; i < patternPositions.length; i += 1) {
patternPositions[i] += 1
}
pattern = `${pattern.substr(0,patternIndex)} ${pattern.substr(patternIndex)}`
}
}
pattern = replaceCharsCore(pattern, indexes, char, patternPositions);
return pattern
};
const formatValue = (value, formatter) => {
if (Array.isArray(value)) {
return value.map((value => (formatter(value) || "").toString()))
}
return (formatter(value) || "").toString()
};
const ESCAPE_CHARS_REGEXP = /[a-zA-Z]/g;
const escapeChars = (pattern, defaultPattern, processedIndexes, patternPositions) => {
const escapeIndexes = defaultPattern.split("").map(((char, index) => {
if (!processedIndexes.includes(index) && (char.match(ESCAPE_CHARS_REGEXP) || "'" === char)) {
return patternPositions[index]
}
return -1
}));
pattern = pattern.split("").map(((char, index) => {
let result = char;
const isCurrentCharEscaped = escapeIndexes.includes(index);
const isPrevCharEscaped = index > 0 && escapeIndexes.includes(index - 1);
const isNextCharEscaped = escapeIndexes.includes(index + 1);
if (isCurrentCharEscaped) {
if (!isPrevCharEscaped) {
result = `'${result}`
}
if (!isNextCharEscaped) {
result = `${result}'`
}
}
return result
})).join("");
return pattern
};
export const getFormat = formatter => {
const processedIndexes = [];
const defaultPattern = formatValue(new Date(2009, 8, 8, 6, 5, 4), formatter);
const patternPositions = defaultPattern.split("").map(((_, index) => index));
let result = defaultPattern;
const replacedPatterns = {};
const datePatterns = [{
date: new Date(2009, 8, 8, 6, 5, 4, 111),
pattern: "S"
}, {
date: new Date(2009, 8, 8, 6, 5, 2),
pattern: "s"
}, {
date: new Date(2009, 8, 8, 6, 2, 4),
pattern: "m"
}, {
date: new Date(2009, 8, 8, 18, 5, 4),
pattern: "H",
isDigit: true
}, {
date: new Date(2009, 8, 8, 2, 5, 4),
pattern: "h",
isDigit: true
}, {
date: new Date(2009, 8, 8, 18, 5, 4),
pattern: "a",
isDigit: false
}, {
date: new Date(2009, 8, 1, 6, 5, 4),
pattern: "d"
}, {
date: [new Date(2009, 8, 2, 6, 5, 4), new Date(2009, 8, 3, 6, 5, 4), new Date(2009, 8, 4, 6, 5, 4)],
pattern: "E"
}, {
date: new Date(2009, 9, 6, 6, 5, 4),
pattern: "M"
}, {
date: new Date(1998, 8, 8, 6, 5, 4),
pattern: "y"
}];
if (!result) {
return
}
datePatterns.forEach((test => {
const diff = getDifference(defaultPattern, formatValue(test.date, formatter), processedIndexes, test.isDigit);
const pattern = "M" === test.pattern && !replacedPatterns.d ? "L" : test.pattern;
result = replaceChars(result, diff, pattern, patternPositions);
replacedPatterns[pattern] = diff.length
}));
result = escapeChars(result, defaultPattern, processedIndexes, patternPositions);
if (processedIndexes.length) {
return result
}
return
};