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import { startsWith } from 'lodash';
import moment from 'moment-timezone';
/**
* Adjust the current date and time to the site settings timezone.
* The timezone can be formatted either as an UTC offset ("UTC+0"),
* or as a timezone identifier ("Europe/London").
* In the first case, the date-time must be adjusted by the UTC offset converted in minutes;
* in the latter, it's enough to use the tz() method provided by Moment.js.
* @see http://momentjs.com/docs/#/manipulating/utc-offset/
* @see http://momentjs.com/timezone/docs/#/using-timezones/parsing-in-zone/
* @param {string} timezoneString A timezone string.
* @returns {Object} The timezone-adjusted Moment.js object of the current date and time.
*/
export function getLocalizedDate( timezoneString ) {
return startsWith( timezoneString, 'UTC' )
? moment().utcOffset( timezoneString.substring( 3 ) * 60 ) // E.g. "UTC+5" -> "+5" * 60 -> 300
: moment.tz( timezoneString );
}
/**
* Mapping object between PHP date() and Moment.js format() tokens.
* The commented tokens exist in PHP but have no direct Moment.js equivalent.
*
* The "S" case is an exception, since it's only used in conjunction with "j":
* PHP `date( 'jS' )` returns "1st", which is equivalent to `moment().format( 'Do' )`)
* @see http://php.net/manual/en/function.date.php#refsect1-function.date-parameters
* @see http://momentjs.com/docs/#/displaying/format/
* @type {Object}
*/
export const phpToMomentMapping = {
d: 'DD',
D: 'ddd',
j: 'D',
l: 'dddd',
N: 'E',
// "S" is andled via custom check
//S: '',
w: 'd',
// Moment.js equivalent of "z" (0 based) is "DDD" (1 based), so it must be adjusted
//z: 'DDD',
W: 'W',
F: 'MMMM',
m: 'MM',
M: 'MMM',
n: 'M',
// Moment.js has no "t" token equivalent, but a `moment().daysInMonth()` function
//t: '',
// Moment.js has no "L" token equivalent, but a `moment().isLeapYear()` function
//L: '',
o: 'Y',
Y: 'YYYY',
y: 'YY',
a: 'a',
A: 'A',
// Moment.js has no "B" token equivalent, but can be generated nonetheless
//B: '',
g: 'h',
G: 'H',
h: 'hh',
H: 'HH',
i: 'mm',
s: 'ss',
u: 'SSSSSS',
v: 'SSS',
e: 'z',
// Moment.js has no "I" token, but a `moment().isDST()` function
//I: '',
O: 'ZZ',
P: 'Z',
// Moment.js has no "T" token equivalent, but is similar enough to "z"
T: 'z',
// Moment.js has no "Z" token equivalent, but can be generated nonetheless
//Z: '',
c: 'YYYY-MM-DDTHH:mm-ssZ',
r: 'ddd, DD MMM YYYY HH:mm:ss ZZ',
U: 'X',
};
/**
* Convert a PHP datetime format string into a Moment.js one.
* @param {Object} momentDate A Moment.js object of the current date and time.
* @param {string} formatString A PHP datetime format string
* @returns {string} A Moment.js datetime format string
*/
export function phpToMomentDatetimeFormat( momentDate, formatString ) {
const mappedFormat = formatString
.split( '' )
.map( ( c, i, a ) => {
const prev = a[ i - 1 ];
const next = a[ i + 1 ];
// Check if character is escaped
if ( '\\' === prev ) {
return `[${ c }]`;
}
if ( '\\' === c ) {
return '';
}
// Check if character is "jS", currently the only double-character token
if ( 'j' === c && 'S' === next ) {
return 'Do';
}
if ( 'S' === c && 'j' === prev ) {
return '';
}
// Check if character is a token mapped as a function
switch ( c ) {
case 'z':
// "DDD" is 1 based but "z" is 0 based
return `[${ momentDate.format( 'DDD' ) - 1 }]`;
case 't':
return `[${ momentDate.daysInMonth() }]`;
case 'L':
// 1 or 0
return `[${ momentDate.isLeapYear() | 0 }]`;
case 'B': {
const utcDate = momentDate.clone().utc();
const swatchTime =
( ( utcDate.hours() + 1 ) % 24 ) + utcDate.minutes() / 60 + utcDate.seconds() / 3600;
return Math.floor( ( swatchTime * 1000 ) / 24 );
}
case 'I':
// 1 or 0
return `[${ momentDate.isDST() | 0 }]`;
case 'Z':
// Timezone offset in seconds
// E.g. "+0100" -> "3600"
return parseInt( momentDate.format( 'ZZ' ), 10 ) * 36;
}
// Check if character is a recognized mapping token
if ( phpToMomentMapping.hasOwnProperty( c ) ) {
return phpToMomentMapping[ c ];
}
// Otherwise, return the character as-is, escaped for Moment.js
return `[${ c }]`;
} )
.join( '' );
return momentDate.format( mappedFormat );
}
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