Calculate the Number of Days Between Two Dates — CodeForge CodeForge — Programming Reference Calculate the Number of Days Between Two Dates Subtracting two calendar dates looks like simple arithmetic until leap years, time zones, and daylight saving transitions all quietly disagree about how long a day actually is. Difficulty: Beginner–Intermediate Languages: Python · Java…

Find the Number of Minutes in a HH:MM:SS Time String — CodeForge CodeForge — Programming Reference Find the Number of Minutes in a HH:MM:SS Time String Splitting a duration string into its parts and turning it back into a single number — and the rounding decision that quietly changes what “number of minutes” even means….

Append a String to a File — CodeForge CodeForge — Programming Reference Append a String to a File Adding text to the end of a file without disturbing what’s already there — the open mode that matters, and why concurrent appends need more care than they look like they do. Difficulty: Beginner Languages: Python ·…