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[AlexandeeerG]

Format Date Advanced
Time flies, standards change. Let's get rid of the routine of changing the date format.

Create a formatDate function that accepts the date string, the old fromFormat array and the new toFormat array. Function returns given date in new format.

The function can change a separator, reorder the date parts of convert a year from 4 digits to 2 digits and back.

When converting from YYYY to YY just use 2 last digit (1997 -> 97).
When converting from YY to YYYY use 20YY if YY < 30 and 19YY otherwise.
Examples:

formatDate(
'2020-02-18',
['YYYY', 'MM', 'DD', '-'],
['YYYY', 'MM', 'DD', '.'],
); // '2020.02.18'

formatDate(
'2020-02-18',
['YYYY', 'MM', 'DD', '-'],
['DD', 'MM', 'YYYY', '.'],
); // '18.02.2020'

formatDate(
'18-02-2020',
['DD', 'MM', 'YYYY', '-'],
['DD', 'MM', 'YY', '/'],
); // '18/02/20'

formatDate(
'20/02/18',
['YY', 'MM', 'DD', '/'],
['YYYY', 'MM', 'DD', '.'],
); // '2020.02.18'

formatDate(
'97/02/18',
['YY', 'MM', 'DD', '/'],
['DD', 'MM', 'YYYY', '.'],
); // '18.02.1997'