User joining date and submission time now renders fine in all browsers.

The trick was to use ISO string for time.

In table submissions, renamed column submitted_at to made_on.

Signed-off-by: Anurag Priyam <anurag08priyam@gmail.com>
Store all date & time values in postgres with time zone.

Signed-off-by: Anurag Priyam <anurag08priyam@gmail.com>
A user has many access_tokens.

Though only one of them will be active at any point of time.

Signed-off-by: Anurag Priyam <anurag08priyam@gmail.com>
Update timestamp when users revise their submission.

Additionally, change column update_at to revised on (in submissions) table.

Signed-off-by: Anurag Priyam <anurag08priyam@gmail.com>