Gmt-pdt -

For professional or social calls, the most convenient overlapping hours occur when it is late afternoon in GMT and early morning in PDT:

The time zone used on the North American West Coast (including cities like Los Angeles, San Francisco, and Vancouver) from mid-March to early November . It is one hour ahead of Pacific Standard Time (PST). Practical Conversion

Originally the international standard of civil time based on the Royal Observatory in Greenwich, London. It is now primarily used as a time zone in parts of Europe and Africa and is often used interchangeably with UTC (Coordinated Universal Time) in casual contexts.