Consolidate time formatting logic into shared utilities

[aaronfuj]

Use of Date object and formatting in Javascript isn't great towards ensuring everything is shown with the correct values. This issue is to ensure that there is a consolidated location of formatting the time and it gets properly shown in a unified way. Some specifics to consider:

• Time on charts (what should be shown, local or HST?)
• Time on forecasts (show HST, imo)
• Time on tide tables (show time corresponding to location, i.e. HST)
• Time for sunrise/sunset (show time corresponding to location, i.e. HST)

Sources of information:

• Buoy
• Tide
• Hawaii state forecast
• Sunrise/Sunset calculator