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PHP: time - Manual
Returns the current time measured in the number of seconds since the Unix Epoch (January 1 1970 00:00:00 GMT).
Unix time - Wikipedia
Unix time (also known as POSIX time [citation needed] or UNIX Epoch time) is a system for describing a point in time, defined as the number of seconds that have elapsed since 00:00:00 Coordinated Universal Time (UTC), Thursday, 1 January 1970,.
Online Conversion - Unix time conversion
Convert Unix time to a readable date. Convert Unix timestamp to Readable Date/time (based on seconds since standard epoch of 1/1/1970)
KML Reference | Keyhole Markup Language | Google Developers
This section contains an alphabetical reference for all KML elements defined in KML Version 2.2, as well as elements in the Google extension namespace.The class tree for KML elements is shown below.
Unix Timestamp Converter / Epoch Converter
An intuitive and powerful tool for converting Unix timestamps and human-readable times.
Current Timestamp
Current UNIX timestamp. 24 hours ago: 1523960244 7 days ago: 1523441844 30 days ago: 1521454644 365 days ago: 1492510644
12.7 Date and Time Functions - MySQL
This section describes the functions that can be used to manipulate temporal values. See Section 11.3, “Date and Time Types”, for a description of the range of values each date and time type has and the valid formats in which values may be specified.
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Internet Control Message Protocol - Wikipedia
Technical details. The Internet Control Message Protocol is part of the Internet Protocol Suite, as defined in RFC 792.ICMP messages are typically used for diagnostic or control purposes or generated in response to errors in IP operations (as specified in RFC 1122).
Microsecond Resolution Time Services for Windows
The Windows Timestamp Project provides high resolution timestamp, timekeeping, and timer routines for Windows