date

A pointer to a buffer to receive the NULL terminated date and time string. To avoid possible truncation of the string, this buffer should be at least 81 bytes long. 

date_len

An optional pointer to a size_t to receive the length in bytes of the returned date and time string. This length does not include the NULL terminator that terminates the host name. A value of NULL can be passed for this call argument.

date_len_max

The maximum size in bytes of the buffer pointed at by the date argument.

time

The date and time for which to generate the string representation. To use the current local time, pass a value of zero for this argument.