take_tzid
Description:
Sets the tzid of the this and assumes ownership of tzid.
 Any previously set TZID is freed. An empty string or a null as tzid is treated as none TZID.
    
Parameters:
| this | |
| tzid | 
           the TZID to take, or null  | 
      
Sets the tzid of the this and assumes ownership of tzid.
 Any previously set TZID is freed. An empty string or a null as tzid is treated as none TZID.
    
| this | |
| tzid | 
           the TZID to take, or null  |