Using new Date().getTime() / 1000 is an incomplete solution for obtaining the seconds, because it produces timestamps with floating-point units:

new Date() / 1000; // 1405792936.933

// Technically, .933 would be in milliseconds

Which may cause unwanted results in conditional statements:

if (1405792936.993 < 1405792937) // true

Instead use:

Math.round(Date.now() / 1000); // 1405792937

// Or
Math.floor(Date.now() / 1000); // 1405792936

// Or
Math.ceil(Date.now() / 1000); // 1405792937

// Note: In general, I recommend `Math.round()`,
//   but there are use cases where
//   `Math.floor()` and `Math.ceil()`
//   might be better suited.

Warning: Bitwise operators could be used to truncate floating-point units, but can also cause issues when working with timestamps. For example, the following bitwise expression (new Date() / 1000) | 0, is less preferred than Math.floor(Date.now() / 1000), because it causes the following issues:

1. By default Javascript numbers are type 64 bit (double precision) floats, and bitwise operators implicitly convert that type into signed 32 bit integers. Arguably, the type should not be implicitly converted by the compiler, but instead explicitly converted by the developer in code.
2. The signed 32 bit integer timestamp produced by the bitwise operator, causes the year 2038 problem as noted in the comments.