dateFormat

The date object

Each keyword below will be replaced in the string by its respective datepart
d: Day of the month as digits; no leading zero for single-digit days.
dd: Day of the month as digits; leading zero for single-digit days.
ddd: Day of the week as a three-letter abbreviation.
dddd: Day of the week as its full name.
e: Day in a week (CF2016u3+).
f: Day of a week in a month (CF2016u3+).
m: Month as digits; no leading zero for single-digit months.
mm: Month as digits; leading zero for single-digit months.
mmm: Month as a three-letter abbreviation.
mmmm: Month as its full name.
k: Hour in a day (CF2016u3+).
w: Week in a month (CF2016u3+).
W: Week in a year (CF2016u3+).
yy: Year as last two digits; leading zero for years less than 10.
yyyy,YYYY: Year represented by four digits.
gg: Period/era string.
z: Time zone in unstandardized abbreviated format, for example, EST (CF2016u3+).
Z: Time zone in hours of offset (RFC 822 TimeZone), for example, +0530 (CF2016u3+).
X: Time zone in hours of offset in ISO 8601 format. (CF2016u3+).

The following keywords are shorthand for specific full formats and cannot be combined with other masks:
short: equivalent to m/d/y
medium: equivalent to mmm d, yyyy
long: equivalent to mmmm d, yyyy
full: equivalent to dddd, mmmm d, yyyy