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/* Port of strftime() by T. H. Doan (https://thdoan.github.io/strftime/)
*
* Day of year (%j) code based on Joe Orost's answer:
* http://stackoverflow.com/questions/8619879/javascript-calculate-the-day-of-the-year-1-366
*
* Week number (%V) code based on Taco van den Broek's prototype:
* http://techblog.procurios.nl/k/news/view/33796/14863/calculate-iso-8601-week-and-year-in-javascript.html
*/
function strftime(sFormat, date) {
if (typeof sFormat !== 'string') {
return '';
}
if (!(date instanceof Date)) {
date = new Date();
}
const nDay = date.getDay();
const nDate = date.getDate();
const nMonth = date.getMonth();
const nYear = date.getFullYear();
const nHour = date.getHours();
const nTime = date.getTime();
const aDays = [
'Sunday',
'Monday',
'Tuesday',
'Wednesday',
'Thursday',
'Friday',
'Saturday'
];
const aMonths = [
'January',
'February',
'March',
'April',
'May',
'June',
'July',
'August',
'September',
'October',
'November',
'December'
];
const aDayCount = [0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334];
const isLeapYear = () => (nYear % 4 === 0 && nYear % 100 !== 0) || nYear % 400 === 0;
const getThursday = () => {
const target = new Date(date);
target.setDate(nDate - ((nDay + 6) % 7) + 3);
return target;
};
const zeroPad = (nNum, nPad) => ((Math.pow(10, nPad) + nNum) + '').slice(1);
return sFormat.replace(/%[a-z]+\b/gi, (sMatch) => {
return (({
'%a': aDays[nDay].slice(0, 3),
'%A': aDays[nDay],
'%b': aMonths[nMonth].slice(0, 3),
'%B': aMonths[nMonth],
'%c': date.toUTCString().replace(',', ''),
'%C': Math.floor(nYear / 100),
'%d': zeroPad(nDate, 2),
'%e': nDate,
'%F': (new Date(nTime - (date.getTimezoneOffset() * 60000))).toISOString().slice(0, 10),
'%G': getThursday().getFullYear(),
'%g': (getThursday().getFullYear() + '').slice(2),
'%H': zeroPad(nHour, 2),
'%I': zeroPad((nHour + 11) % 12 + 1, 2),
'%j': zeroPad(aDayCount[nMonth] + nDate + ((nMonth > 1 && isLeapYear()) ? 1 : 0), 3),
'%k': nHour,
'%l': (nHour + 11) % 12 + 1,
'%m': zeroPad(nMonth + 1, 2),
'%n': nMonth + 1,
'%M': zeroPad(date.getMinutes(), 2),
'%p': (nHour < 12) ? 'AM' : 'PM',
'%P': (nHour < 12) ? 'am' : 'pm',
'%s': Math.round(nTime / 1000),
'%S': zeroPad(date.getSeconds(), 2),
'%u': nDay || 7,
'%V': (() => {
const target = getThursday();
const n1stThu = target.valueOf();
target.setMonth(0, 1);
const nJan1 = target.getDay();
if (nJan1 !== 4) {
target.setMonth(0, 1 + ((4 - nJan1) + 7) % 7);
}
return zeroPad(1 + Math.ceil((n1stThu - target) / 604800000), 2);
})(),
'%w': nDay,
'%x': date.toLocaleDateString(),
'%X': date.toLocaleTimeString(),
'%y': (nYear + '').slice(2),
'%Y': nYear,
'%z': date.toTimeString().replace(/.+GMT([+-]\d+).+/, '$1'),
'%Z': date.toTimeString().replace(/.+\((.+?)\)$/, '$1'),
'%Zs': new Intl.DateTimeFormat('default', {
timeZoneName: 'short',
}).formatToParts(date).find((oPart) => oPart.type === 'timeZoneName')?.value,
}[sMatch] || '') + '') || sMatch;
});
}
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