[Date/time] Unify formatting

[meissadia]

Reference: https://github.com/cfpb/sbl-frontend/pull/524#pullrequestreview-2059461835

• [x] When a month is used with a specific date, abbreviate Jan., Feb., Aug., Sep., Oct., Nov., and Dec., but not March, April, May, June, and July
• [x] For time, Use lowercase a.m. and p.m., with periods
• [ ] Include a space between the time (number) and the a.m. or p.m.
• [ ] If it’s an exact hour, do not include “:00″
• [x] Abbreviate the time zone when it appears with a specific time. To simplify time zones and Daylight Saving Time, use ET, CT, MT, or PT to indicate Eastern time, Central time, etc.

[billhimmelsbach]

I think this has been completed, but will research a bit more.