#58 SMPPDate does not parse the 12-character version

[Oran Kelly]

Report received via the forums:

"I am running into a problem while receiving a QuerySMResp for a delivered
message. The final date string returned by the SMSC is not 16 characters instead,
it is 12 characters i.e YYmmddhhmmss for e.g

1. API throws an unrecognized date format exception. How do I get
   around this issue please."

The problem is that SMPPDate will only accept a 16-character string to parse, whereas the specification allows for a shorter 12-character version.

[Oran Kelly]

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I have committed a fix for SMPPDate to support parsing the 12-character version. Will be part of the next release.