Bash unable to print epoch timestamp

[Don Harrop]

Bash outputs no value when using it's built in method of printing an 
"epoch" timestamp.

BashCommandLine#: printf '%(%s)T' -1

I've verified the same behavior with others on IRC.

Below are my relevant pieces of cygcheck.exe -s

Windows 7 Enterprise Ver 6.1 Build 7601 Service Pack 1

Cygwin DLL version info:
     DLL version: 2.2.1
     DLL epoch: 19
     DLL old termios: 5
     DLL malloc env: 28
     Cygwin conv: 181
     API major: 0
     API minor: 289
     Shared data: 5
     DLL identifier: cygwin1
     Mount registry: 3
     Cygwin registry name: Cygwin
     Installations name: Installations
     Cygdrive default prefix:
     Build date:
     Shared id: cygwin1S5

Package                  Version            Status
bash                     4.3.42-3           OK
base-cygwin              3.8-1              OK
base-files               4.2-3              OK
cygwin                   2.2.1-1            OK
util-linux               2.25.2-2           OK


Cheers!
  - Don

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