Quick Reference to iOS NSDateFormats

Generally people don't remember the formats string while they use NSDateFormatter. This reference will provide a easy to remember quick guides.

• y = year
• Y = Year (This year designation is used in ISO year-week calendar as defined by ISO 8601, but can be used in non-Gregorian based calendar systems where week date processing is desired. May not always be the same value as calendar year.)
• Q = quarter
• M = month
• w = week of year
• W = week of month
• d = day of the month
• D = day of year
• E = day of week
• a = period (AM or PM)
• h = hour (1-12)
• H = hour (0-23)
• m = minute
• s = second
• z = zone

Commonly used NSDateFormat String -

@"E, d M y"                                                    - Mon, 1 5 2015

@"EE, dd MM yy"                                          - Mon, 01 05 15

@"EEE, ddd MMM yyy"                                - Mon, 001 May 2015

@"EEEE, dddd MMMM yyyy                        - Monday, 0001 May 2015

@"dd-MM-yyyy"                                             - 01-05- 2015

@"dd-MM-yyyy HH:mm:ss"                          - 01-05- 2015 15:10:10

@"dd-MM-yyyy hh:mm:ss a"                         - 01-05- 2015 10:15:12 AM

@"EEE, dd MMM yyyy HH:mm:ss Z"          - Mon, 06 Sep 2009 16:45:00 -0900