datetime: ignore 0 days or months in dates
datetime: ignore 0 days or months in dates

Handle 0 months or days correctly in date strings, so that
2012-06-00 is parsed the same as 2012-06, for example.

lovebug356/gstreamer,centricular/gstreamer,mparis/gstreamer,StreamUtils/gstreamer,krieger-od/gstreamer,StreamUtils/gstreamer,jpxiong/gstreamer,Lachann/gstreamer,shelsonjava/gstreamer,shelsonjava/gstreamer,mparis/gstreamer,mparis/gstreamer,jpakkane/gstreamer,ensonic/gstreamer,justinjoy/gstreamer,ensonic/gstreamer,collects/gstreamer,ensonic/gstreamer,collects/gstreamer,StreamUtils/gstreamer,cablelabs/gstreamer,Lachann/gstreamer,cfoch/gstreamer,jpxiong/gstreamer,centricular/gstreamer,cablelabs/gstreamer,surround-io/gstreamer,krichter722/gstreamer,jpxiong/gstreamer,shelsonjava/gstreamer,krieger-od/gstreamer,surround-io/gstreamer,surround-io/gstreamer,surround-io/gstreamer,lovebug356/gstreamer,krichter722/gstreamer,justinjoy/gstreamer,cfoch/gstreamer,centricular/gstreamer,Lachann/gstreamer,collects/gstreamer,cablelabs/gstreamer,mparis/gstreamer,jpakkane/gstreamer,cfoch/gstreamer,shelsonjava/gstreamer,collects/gstreamer,mparis/gstreamer,ensonic/gstreamer,jpakkane/gstreamer,collects/gstreamer,krieger-od/gstreamer,lubosz/gstreamer,StreamUtils/gstreamer,jpakkane/gstreamer,krichter722/gstreamer,lubosz/gstreamer,krichter722/gstreamer,centricular/gstreamer,justinjoy/gstreamer,shelsonjava/gstreamer,centricular/gstreamer,lovebug356/gstreamer,ensonic/gstreamer,Lachann/gstreamer,lubosz/gstreamer,cfoch/gstreamer,krichter722/gstreamer,cablelabs/gstreamer,surround-io/gstreamer,Lachann/gstreamer,lovebug356/gstreamer,jpxiong/gstreamer,jpakkane/gstreamer,cfoch/gstreamer,justinjoy/gstreamer,cablelabs/gstreamer,lubosz/gstreamer,StreamUtils/gstreamer,justinjoy/gstreamer,krieger-od/gstreamer,lubosz/gstreamer,lovebug356/gstreamer,jpxiong/gstreamer,krieger-od/gstreamer