Dates

The built-in Date class is the standard way to handle dates and times.

When you create a new Date object, it will initialize to the current timestamp (i.e. now).

Creating a Date

• from timestamp
• month is 0 based (new Date(y, m, d))

Timestamps

• intro on timestamps

• UNIX timestamps

Date strings

• allowed formats

Parsing is tricky due to inconsistencies across browsers. Prefer ISO format:

• Avoid non-standard formats like "04/11/2025" which may behave differently in different locales.

Manipulating dates

• retrieving year, month, date, etc
• modifying date
• correctly managing timestamps

Timezones

• all about timezones
• The Date object always stores dates in UTC internally.
• Use Intl.DateTimeFormat for time zone-aware formatting

Comparing dates

• timezones get involved

Formatting dates