CLDR / ICU pattern to Ruby strftime.

22 of 26 fields map cleanly; 4 have no Ruby strftime token.

Ruby strftime

%y%y-%m-%d %H:%M

Reference · Mon, Jan 2 2006, 3:04:05 PM MST

0606-01-02 15:04

Right now, your zone

…

Both sides render the same instant — the translation is faithful.

CLDR / ICU pattern	Ruby strftime	Field	Example
y	%Y	Four-digit year	2006
yy	%y	Two-digit year	06
M	%-m	Month number	1
MM	%m	Month number, padded	01
MMM	%b	Month name, abbreviated	Jan
MMMM	%B	Month name, full	January
d	%-d	Day of month	2
dd	%d	Day of month, padded	02
E	%a	Weekday, abbreviated	Mon
EEEE	%A	Weekday, full	Monday
D	%j	Day of year	2
w	%V	Week of year	1
Y	%G	ISO week-based year	2006
H	no token	Hour, 24-hour clock	15
HH	%H	Hour, 24-hour clock, padded	15
h	no token	Hour, 12-hour clock	3
hh	%I	Hour, 12-hour clock, padded	03
a	%p	AM/PM marker	PM
mm	%M	Minute, padded	04
ss	%S	Second, padded	05
S	%L	Fractional seconds	000
xx	%z	UTC offset, basic	-0700
xxx	%:z	UTC offset, extended	-07:00
z	%Z	Time-zone name, short	MST
G	no token	Era	AD
Q	no token	Quarter	1