gristlabs_grist-core/app/common/timeFormat.ts
Paul Fitzpatrick 5ef889addd (core) move home server into core
Summary: This moves enough server material into core to run a home server.  The data engine is not yet incorporated (though in manual testing it works when ported).

Test Plan: existing tests pass

Reviewers: dsagal

Reviewed By: dsagal

Differential Revision: https://phab.getgrist.com/D2552
2020-07-21 20:39:10 -04:00

57 lines
1.9 KiB
TypeScript

/**
* timeFormat(format, date) formats the passed-in Date object using the format string. The format
* string may contain the following:
* 'h': hour (00 - 23)
* 'm': minute (00 - 59)
* 's': second (00 - 59)
* 'd': day of the month (01 - 31)
* 'n': month (01 - 12)
* 'y': 4-digit year
* 'M': milliseconds (000 - 999)
* 'Y': date as 20140212
* 'D': date as 2014-02-12
* 'T': time as 00:51:06
* 'A': full time and date, as 2014-02-12 00:51:06.123
* @param {String} format The format string.
* @param {Date} date The date/time object to format.
* @returns {String} The formatted date and/or time.
*/
function pad(num: number, len: number): string {
const s = num.toString();
return s.length >= len ? s : "00000000".slice(0, len - s.length) + s;
}
type FormatHelper = (out: string[], date: Date) => void;
const timeFormatKeys: {[spec: string]: FormatHelper} = {
h: (out, date) => out.push(pad(date.getHours(), 2)),
m: (out, date) => out.push(pad(date.getMinutes(), 2)),
s: (out, date) => out.push(pad(date.getSeconds(), 2)),
d: (out, date) => out.push(pad(date.getDate(), 2)),
n: (out, date) => out.push(pad(date.getMonth() + 1, 2)),
y: (out, date) => out.push("" + date.getFullYear()),
M: (out, date) => out.push(pad(date.getMilliseconds(), 3)),
Y: (out, date) => timeFormatHelper(out, 'ynd', date),
D: (out, date) => timeFormatHelper(out, 'y-n-d', date),
T: (out, date) => timeFormatHelper(out, 'h:m:s', date),
A: (out, date) => timeFormatHelper(out, 'D T.M', date),
};
function timeFormatHelper(out: string[], format: string, date: Date) {
for (let i = 0, len = format.length; i < len; i++) {
const c = format[i];
const helper = timeFormatKeys[c];
if (helper) {
helper(out, date);
} else {
out.push(c);
}
}
}
export function timeFormat(format: string, date: Date): string {
const out: string[] = [];
timeFormatHelper(out, format, date);
return out.join("");
}