iso-string.js
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import absFloor from '../utils/abs-floor';
var abs = Math.abs;
function sign(x) {
return (x > 0) - (x < 0) || +x;
}
export function toISOString() {
// for ISO strings we do not use the normal bubbling rules:
// * milliseconds bubble up until they become hours
// * days do not bubble at all
// * months bubble up until they become years
// This is because there is no context-free conversion between hours and days
// (think of clock changes)
// and also not between days and months (28-31 days per month)
if (!this.isValid()) {
return this.localeData().invalidDate();
}
var seconds = abs(this._milliseconds) / 1000,
days = abs(this._days),
months = abs(this._months),
minutes,
hours,
years,
s,
total = this.asSeconds(),
totalSign,
ymSign,
daysSign,
hmsSign;
if (!total) {
// this is the same as C#'s (Noda) and python (isodate)...
// but not other JS (goog.date)
return 'P0D';
}
// 3600 seconds -> 60 minutes -> 1 hour
minutes = absFloor(seconds / 60);
hours = absFloor(minutes / 60);
seconds %= 60;
minutes %= 60;
// 12 months -> 1 year
years = absFloor(months / 12);
months %= 12;
// inspired by https://github.com/dordille/moment-isoduration/blob/master/moment.isoduration.js
s = seconds ? seconds.toFixed(3).replace(/\.?0+$/, '') : '';
totalSign = total < 0 ? '-' : '';
ymSign = sign(this._months) !== sign(total) ? '-' : '';
daysSign = sign(this._days) !== sign(total) ? '-' : '';
hmsSign = sign(this._milliseconds) !== sign(total) ? '-' : '';
return (
totalSign +
'P' +
(years ? ymSign + years + 'Y' : '') +
(months ? ymSign + months + 'M' : '') +
(days ? daysSign + days + 'D' : '') +
(hours || minutes || seconds ? 'T' : '') +
(hours ? hmsSign + hours + 'H' : '') +
(minutes ? hmsSign + minutes + 'M' : '') +
(seconds ? hmsSign + s + 'S' : '')
);
}