# bson_append_date_time()¶

## Synopsis¶

#define BSON_APPEND_DATE_TIME(b, key, val) \
bson_append_date_time (b, key, (int) strlen (key), val)

bool
bson_append_date_time (bson_t *bson,
const char *key,
int key_length,
int64_t value);


## Parameters¶

• bson: A bson_t.
• key: An ASCII C string containing the name of the field.
• key_length: The length of key in bytes, or -1 to determine the length with strlen().
• value: The date and time as specified in milliseconds since the UNIX epoch.

## Description¶

The bson_append_date_time() function shall append a new element to a bson document containing a date and time with no timezone information. value is assumed to be in UTC format of milliseconds since the UNIX epoch. value MAY be negative.

## Returns¶

Returns true if the operation was applied successfully. The function will fail if appending value grows bson larger than INT32_MAX.