What is a periodic function that can calculate daylight hours of any given city at any given day?
99555
Hours of light per day based on latitude/longitude formula
149825
C#: what is the easiest way to subtract time?
140240
Is there any easy way to increment a DateTime by monthly/yearly/daily units without having to parse it out like crazy?
142456
How can I get the correct offset between UTC and local times for a date that is before or after DST?
12561
How to nest my own "times" function to get powers
136999
Calculate number of hours between 2 dates in PHP
136009
Call a javascript function at a specific time of day
77556
How to calculate incident solar energy on earth in a given day with a spectral filter
86459
Compare current time with two times-of-day strings
27697
Clocks for multiple timezones in GNOME Shell
44889
Is there a good automatic time tracking tool for Mac OS X
134074
What is the approximation equation for making the day/night wave
121875
How to round time to the nearest quarter hour in java?
123188
Getting the Time component of a Java Date or Calendar
156730
How to determine if the specific time is between given time range in javascript
12629
calc the working hours between 2 dates in PHP
48342
How can I find out what the weather is like in a given location on a certain month?