[Typo3] TCA tt_content starttime/endtime with TSConfig

[Yomo Guiamo]

Hi,

I'm trying to set a default starttime and endtime value for all (new) 
content elements (made via the Page Module).

I've tried the following, but only 'hardcoded' UNIX times seem to work.

(In the UserTSConfig)
TCAdefaults.tt_content.starttime = 955144722 (produces: 10-1-1973)

However, if I try to set a dynamic datetime value, nothing seems to work:
TCAdefaults.tt_content.starttime = %d-%m-%y (doesn't work)
TCAdefaults.tt_content.starttime = d (doesn't work)
TCAdefaults.tt_content.starttime = %T (doesn't work)
TCAdefaults.tt_content.starttime = {date:U} (doesn't work)
TCAdefaults.tt_content.starttime.strftime = %d-%m-%y (doesn't work)
TCAdefaults.tt_content.starttime = date:U (doesn't work)

Any help is appreciated!

Thank you,
Yomo Guiamo