Fix parsing of typed input with use-utc=true

[ij1]

Date.parse assumes non-UTC dates by default, which results in incorrect date calculation with use-utc=true. As Date.parse itself has no UTC variant, fix this problem by appending " UTC" into the end of the date to designate the timezone of the parsed date string.

This fixed at least #666 and may also fix some other issues.

[coveralls]

Coverage remained the same at 100.0% when pulling 453a27f on ij1:typeable-utc-fix into de0fc75 on charliekassel:master.

[tuan-bui]

Thanks for the fix!

This fix updates initial date throwing incorrect date when not passing in an initial date with use-utc=true.

Would we be able to get this merged in the next update @charliekassel ?