formatWithSimplePattern

Format according to a simple (but limited) formatting pattern.

Each letter in the pattern corresponds to one particular part of a timestamp. Repeating a letter sets the minimum length of that particular part. For instance, where h:m:s would produce 1:2:3, hh:mm:ss would produce 01:02:02. All parts are padded with 0s and right-aligned, except f (fraction of a second) which is left-aligned. This allows simple usage in the most common cases. For example: mm:hh:ss.fff displays the time up to the millisecond, while mm:hh:ss.ffffff shows microseconds. One more special case is Y, which is a 4-digit number, except when specified only once or twice, in which case it is treated like a two-digit number. I.e. YYYYYY produces 002024 while YY produces 24 (omitting the century).

Supported letters are:

• Y – the year (4 digits or 2 digits as mentioned above)

• M – the month of the year (1 to 12)

• D – the day of the month (1 to 31)

• h – the hour of the day (0 to 23)

• m – the minute of the hour (0 to 59)

• s – the second of the minute (0 to 59)

• f – the fraction of the second (think of this as the fractional part of a number between 0 and 1)