px.Time should be a valid type for all acceptable inputs to px.DataFrame

[sync-by-unito[bot]]

Scripts specify start_time as a str. This makes the system incompatible with integer times that come from px.now(). We should make sure that px.Time can be valid type. The current issue is that using px.Time will fail for string arguments. It probably should pass for string arguments that can parse into valid times.

┆Issue is synchronized with this Jira Story by Unito