yyyy'-'MM'-'dd'T'HH':'mm':'ss - What is the meaning of 'T' here?

What is the meaning of T in this datetime pattern ?

yyyy'-'MM'-'dd'T'HH':'mm':'ss 2011-06-14T04:12:36

It just shows the start of the Time component in a standard ISO 8601 date time string. Wikipedia has a detailed page about this standard format.

In ISO 8601 (UTC) T is used to designate the Time component. See "Combined date and time representations" in http://en.wikipedia.org/wiki/ISO_8601#Combined_date_and_time_representations

Find out about UTC here: http://en.wikipedia.org/wiki/Coordinated_Universal_Time.

[T] is time designator for ISO 8601 format of <date>T<time>.

it means "Time". this has been asked and answered a lot. see http://www.w3.org/TR/NOTE-datetime.html

It's from ISO 8601 which specifies a standard timestamp format:

The character [T] shall be used as time designator to indicate the start of the representation of the time of day component in these expressions.