Date and Time
Working with dates and times starts with deciding what a value represents: a calendar date, an instant or an elapsed duration. That choice affects how you store, compare and display it.
Use the universal time converter to compare local dates and times. For code timing, read about JavaScript clocks and performance measurements. The Google Calendar integration article from 2008 offers a historical look at working with calendar events.
Universal time converter
Convert dates and times between time zones. Understand UTC offsets, daylight saving and date changes, with JavaScript and Python conversion examples.
Meet Our New Universal Time Converter
Compare dates and times across time zones with our free converter. Check daylight-saving changes, read Unix timestamps and share a conversion link.
W3C Updates High Resolution Time Draft: What JavaScript Performance Measurements Need to Get Right
The W3C published a High Resolution Time Working Draft on November 6, 2026. Here is what performance.now(), timeOrigin and timer privacy mean for developers.
Integrate your PHP application with Google Calendar
Vikram Vaswani writes a very nice article on how to use PHP to process and integrate data from Google Calendar into a custom application. "This article will…