This is self explanatory and the only reason this exist is to have it handly for very quick reference as it is slightly different than in other languages like for instance in C#
d day of the month with leading zeros 03 or 17
j day of the month without leading zeros 3 or 17
D day of the week as a three-letter abbreviation Mon
l full day of the week Monday
m month as a number with leading zeros 09 or 12
n month as a number without leading zeros 9 or 12
M month as a three-letter abbreviation Sep
h – Represents hour in 12-hour format with leading zeros (01 to 12).
H – Represents hour in in 24-hour format with leading zeros (00 to 23).
i – Represents minutes with leading zeros (00 to 59).
F full month September
y two-digit year 18
Y full year 2018
a – Represents lowercase ante meridian and post meridian (am or pm).
A – Represents uppercase ante meridian and post meridian (AM or PM).