What format string do I use for milliseconds in date strings on iPhone?

Question

I\'m required to parse strings in a format that includes milliseconds. What format string do I use to get the right date value?

For example, suppose I have a string

Answer 1

It's SSS, per the Unicode Locale Data Markup Language spec.

"yyyy-MM-dd'T'HH:mm:ss.SSS"

More generally, use any number of upper-case S characters to get that many decimal places in the fractions-of-a-second component. (So ss.S will show the time to the nearest tenth of a second, for example.)