XVIII. Date and Time functions
- Spis treści
 - checkdate -- Validate a gregorian date/time
 - date -- Format a local time/date
 - getdate -- Get date/time information
 - gettimeofday -- Get current time
 - gmdate -- Format a GMT/CUT date/time
 - gmmktime -- Get UNIX timestamp for a GMT date
 - gmstrftime -- 
     Format a GMT/CUT time/date according to locale settings
    
 - localtime -- Get the local time
 - microtime -- 
     Return current UNIX timestamp with microseconds
 - mktime -- Get UNIX timestamp for a date
 - strftime -- 
     Format a local time/date according to locale settings
    
 - time -- Return current UNIX timestamp
 - strtotime -- 
     Parse about any English textual datetime description into a UNIX
     timestamp