Function group time

Function group has those functions and groups:

• Function now - Return the current time as seconds since epoch.
• Function format_time - Format a date/time into a string
• Function parse_time_with_zone - Parse a date/time from a string into seconds since epoc. This version expect to get the time zone as well
• Function parse_time - Parse a date/time from a string into seconds since epoc

Use additional help with a function name to see more details about the function.