from_iso8601 (iso_date)

add (microseconds)

to_iso8601 ()


class GLib.TimeVal

Represents a precise time, with seconds and microseconds.

Similar to the struct timeval returned by the gettimeofday() UNIX system call.

GLib is attempting to unify around the use of 64-bit integers to represent microsecond-precision time. As such, this type will be removed from a future version of GLib. A consequence of using glong for tv_sec is that on 32-bit systems GTimeVal is subject to the year 2038 problem.

Deprecated since version 2.62: Use GLib.DateTime or #guint64 instead.

classmethod from_iso8601(iso_date)[source]

iso_date (str) – an ISO 8601 encoded date string


True if the conversion was successful.


a GLib.TimeVal

Return type:

(bool, time_: GLib.TimeVal)

Converts a string containing an ISO 8601 encoded date and time to a GLib.TimeVal and puts it into time_.

iso_date must include year, month, day, hours, minutes, and seconds. It can optionally include fractions of a second and a time zone indicator. (In the absence of any time zone indication, the timestamp is assumed to be in local time.)

Any leading or trailing space in iso_date is ignored.

This function was deprecated, along with GLib.TimeVal itself, in GLib 2.62. Equivalent functionality is available using code like:

GDateTime *dt = g_date_time_new_from_iso8601 (iso8601_string, NULL);
gint64 time_val = g_date_time_to_unix (dt);
g_date_time_unref (dt);

New in version 2.12.

Deprecated since version 2.62: GLib.TimeVal is not year-2038-safe. Use GLib.DateTime.new_from_iso8601() instead.


microseconds (int) – number of microseconds to add to time

Adds the given number of microseconds to self. microseconds can also be negative to decrease the value of self.

Deprecated since version 2.62: GLib.TimeVal is not year-2038-safe. Use guint64 for representing microseconds since the epoch, or use GLib.DateTime.


a newly allocated string containing an ISO 8601 date, or None if self was too large

Return type:

str or None

Converts self into an RFC 3339 encoded string, relative to the Coordinated Universal Time (UTC). This is one of the many formats allowed by ISO 8601.

ISO 8601 allows a large number of date/time formats, with or without punctuation and optional elements. The format returned by this function is a complete date and time, with optional punctuation included, the UTC time zone represented as “Z”, and the tv_usec part included if and only if it is nonzero, i.e. either “YYYY-MM-DDTHH:MM:py:data::SSZ<GLib.TimeVal.props.SSZ>" or “YYYY-MM-DDTHH:MM:SS.fffffZ”.

This corresponds to the Internet date/time format defined by RFC 3339, and to either of the two most-precise formats defined by the W3C Note Date and Time Formats. Both of these documents are profiles of ISO 8601.

Use GLib.DateTime.format() or g_strdup_printf() if a different variation of ISO 8601 format is required.

If self represents a date which is too large to fit into a struct tm, None will be returned. This is platform dependent. Note also that since GTimeVal stores the number of seconds as a glong, on 32-bit systems it is subject to the year 2038 problem. Accordingly, since GLib 2.62, this function has been deprecated. Equivalent functionality is available using:

GDateTime *dt = g_date_time_new_from_unix_utc (time_val);
iso8601_string = g_date_time_format_iso8601 (dt);
g_date_time_unref (dt);

The return value of GLib.TimeVal.to_iso8601() has been nullable since GLib 2.54; before then, GLib would crash under the same conditions.

New in version 2.12.

Deprecated since version 2.62: GLib.TimeVal is not year-2038-safe. Use GLib.DateTime.format_iso8601(dt) instead.