| calendar_week_mod() | Get number of days since the start of the week. |
| current_time() | Retrieve the current time based on specified type. |
| get_calendar() | Display calendar with days that have posts as links. |
| get_date_from_gmt() | Converts a GMT date into the correct format for the blog. |
| get_gmt_from_date() | Returns a date in the GMT equivalent. |
| get_weekstartend() | Get the week start and end from the datetime or date string from MySQL. |
| human_time_diff() | Determines the difference between two timestamps. |
| mysql2date() | Convert given date string into a different format. |
| wp_maybe_decline_date() | Determines if the date should be declined. |