PCalc vs World Clocks / Time Converter

PCalc is the powerful choice for scientists, engineers, students, programmers, or indeed anybody looking for a feature rich calculator. It includes an optional RPN mode and multi-line display, a choice of button layouts, an extensive set of unit conversions and constants, a paper tape, multiple undo and redo, engineering and scientific notation, as well as support for hexadecimal, octal, and binary calculations. Includes an Apple Watch app, so you can calculate on your wrist!

World Clocks displays time in 12 different time zones around the world. More than 400 towns in the world along with the accurate DST rules applied are available for your clock selection. If you do not find your town in the list, you can select a nearby town and assign your own customized name to the clock. For all cities the accurate DST (Day Light Saving) rules are maintained for this year and for several more years to come. All clocks are thoroughly tested for DST rules at various cities. For example, Karachi (Pakistan) applied DST in 2009, but does not apply DST in 2010 and all future years through 2019. All such rules are carefully coded and tested. Observing a DST rule, a clock will advance or decline automatically at the DST transition. Thus, NO TIME ADJUSTMENTS ARE REQUIRED EVER ON ANY OF THE CLOCKS. Salient Features: •12 clocks for 12 different timezones in the world •Timezone selection based on a searchable list of 400+ cities •A very friendly user interface for city selection •Customized name for each clock •Extremely accurate application of DST rules for all cities in the list •Automatic time adjustment (both advance and decline) at DST transition •All clocks are perpetual (accounts for DST rules in coming years) •All settings are persistent YOU WILL NEVER NEED TO REFER TO INTERNET OR ANY OTHER CLOCK FOR KNOWING THE TIME IN DIFFERENT PARTS OF THE WORLD. WATCH THE DEMO: http://www.youtube.com/watch?v=RtrM8zf_k0k