Bash unable to print epoch timestamp

[Don Harrop <don at effx dot us>]

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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