This small Python module parses various kinds of time expressions.

Python-isodate is a python module for parsing and formatting ISO 8601 dates, time and duration.

This library provides a timezone database for Python.

Arrow is a Python library to creating, manipulating, formatting and converting dates, times, and timestamps. It implements and updates the datetime type.

This package includes the necessary headers for using LinuxPPS PPSAPI kernel interface in user-space applications, and several support tools.

The strict_rfc3339 Python module provides strict, simple, lightweight RFC3339 (Date and Time on the Internet: Timestamps) procedures.

It enables or aims to:

• Convert UNIX timestamps to and from RFC3339.

• Produce RFC3339 strings with a UTC offset (Z) or with the offset that the C time module reports is the local timezone offset.

• Be simple with minimal dependencies/libraries.

• Avoid timezones as much as possible.

• Be very strict and follow RFC3339.

Tzlocal returns a tzinfo object with the local timezone information. This module attempts to fix a glaring hole in pytz, that there is no way to get the local timezone information, unless you know the zoneinfo name, and under several distributions that's hard or impossible to figure out.

The package ciso8601 converts ISO 8601 or RFC 3339 date time strings into Python datetime objects.

Dehydrated is a client for obtaining certificates from an ACME server (such as Let's Encrypt) implemented as a relatively simple Bash script.

Crypt::OpenSSL::RSA does RSA encoding and decoding (using the OpenSSL libraries).

mbed TLS, formerly known as PolarSSL, makes it trivially easy for developers to include cryptographic and SSL/TLS capabilities in their (embedded) products, facilitating this functionality with a minimal coding footprint.

This library provides a C99 implementation of SSL/TLS. It is designed to be familiar to users of the widely-used POSIX I/O APIs. It supports blocking, non-blocking, and full-duplex I/O. There are no locks or mutexes.

As it can be difficult to keep track of which encryption algorithms and protocols are best to use, s2n-tls features a simple API to use the latest default set of preferences. Remaining on a specific version for backwards compatibility is also supported.

OpenSSL is an implementation of SSL/TLS.

GnuTLS is a secure communications library implementing the SSL, TLS and DTLS protocols. It is provided in the form of a C library to support the protocols, as well as to parse and write X.509, PKCS #12, OpenPGP and other required structures.

mbed TLS, formerly known as PolarSSL, makes it trivially easy for developers to include cryptographic and SSL/TLS capabilities in their (embedded) products, facilitating this functionality with a minimal coding footprint.

LibreSSL is a version of the TLS/crypto stack, forked from OpenSSL in 2014 with the goals of modernizing the codebase, improving security, and applying best practice development processes. This package also includes a netcat implementation that supports TLS.

OpenSSL is an implementation of SSL/TLS.

AWS libcrypto (aws-lc) contains portable C implementations of algorithms needed for TLS and common applications, and includes optimized assembly versions for x86 and ARM.

This package provides Guile bindings to GnuTLS, a library implementation the TLS protocol. It supersedes the Guile bindings that were formerly provided as part of GnuTLS.

Crypt::OpenSSL::Random is a OpenSSL/LibreSSL pseudo-random number generator

mbed TLS, formerly known as PolarSSL, makes it trivially easy for developers to include cryptographic and SSL/TLS capabilities in their (embedded) products, facilitating this functionality with a minimal coding footprint.

GNU libtasn1 is a library implementing the ASN.1 notation. It is used for transmitting machine-neutral encodings of data objects in computer networking, allowing for formal validation of data according to some specifications.

Certbot automatically receives and installs X.509 certificates to enable Transport Layer Security (TLS) on servers. It interoperates with the Let’s Encrypt certificate authority (CA), which issues browser-trusted certificates for free.

This module offers some high level convenience functions for accessing web pages on SSL servers (for symmetry, the same API is offered for accessing http servers, too), an sslcat() function for writing your own clients, and finally access to the SSL api of the SSLeay/OpenSSL package so you can write servers or clients for more complicated applications.