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/* Port of strftime(). Compatibility notes:
*
* %c - formatted string is slightly different
* %D - not implemented (use "%m/%d/%y" or "%d/%m/%y")
* %e - space is not added
* %E - not implemented
* %h - not implemented (use "%b")
* %k - space is not added
* %n - not implemented (use "\n")
* %O - not implemented
* %r - not implemented (use "%I:%M:%S %p")
* %R - not implemented (use "%H:%M")
* %t - not implemented (use "\t")
* %T - not implemented (use "%H:%M:%S")
* %U - not implemented
* %W - not implemented
* %+ - not implemented
* %% - not implemented (use "%")
*
* strftime() reference:
* http://man7.org/linux/man-pages/man3/strftime.3.html
*
* 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
*/
export default function strftime(sFormat, date) {
if (!(date instanceof Date)) date = new Date();
let nDay = date.getDay(),
nDate = date.getDate(),
nMonth = date.getMonth(),
nYear = date.getFullYear(),
nHour = date.getHours(),
aDays = ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'],
aMonths = ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'],
aDayCount = [0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334],
isLeapYear = function () {
return (nYear % 4 === 0 && nYear % 100 !== 0) || nYear % 400 === 0;
},
getThursday = function () {
let target = new Date(date);
target.setDate(nDate - ((nDay + 6) % 7) + 3);
return target;
},
zeroPad = function (nNum, nPad) {
return ('' + (Math.pow(10, nPad) + nNum)).slice(1);
};
return sFormat.replace(/%[a-z]/gi, function (sMatch) {
return {
'%a': aDays[nDay].slice(0, 3),
'%A': aDays[nDay],
'%b': aMonths[nMonth].slice(0, 3),
'%B': aMonths[nMonth],
'%c': date.toUTCString(),
'%C': Math.floor(nYear / 100),
'%d': zeroPad(nDate, 2),
'%e': nDate,
'%F': date.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),
'%M': zeroPad(date.getMinutes(), 2),
'%p': (nHour < 12) ? 'AM' : 'PM',
'%P': (nHour < 12) ? 'am' : 'pm',
'%s': Math.round(date.getTime() / 1000),
'%S': zeroPad(date.getSeconds(), 2),
'%u': nDay || 7,
'%V': (function () {
let target = getThursday(),
n1stThu = target.valueOf();
target.setMonth(0, 1);
let 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')
}[sMatch] || sMatch;
});
}
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