Create datetime-formatting.md

Author: ThePoetCoder

posts/datetime-formatting.md

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+# Datetime Formatting
+
+You are likely very familiar with formating datetimes in Excel, with format strings such as "MM-DD-YYYY". 
+But Python has its own format strings that are, in my opinion, less intuitive. 
+So I've built the below table to help you translate between your current knowledge and Python.
+
+For all examples below I will use the datetime `6/3/2002 01:04:09`
+
+| Excel Format | Python Format | Example |
+| -------- | -------- | -------- |
+| "M" | "%-m" | 6 |
+| "MM" | "%m" | 06 |
+| "MMM" | "%b" | Jun |
+| "MMMM" | "%B" | June |
+| "D" | "%-d" | 3 |
+| "DD" | "%d" | 03 |
+| "DDD" | "%a" | Fri |
+| "DDDD" | "%A" | Friday |
+| "YY" | "%y" | 02 |
+| "YYYY" | "%Y" | 2002 |
+| "H" | "%-H" | 1 |
+| "HH" | "%H" | 01 |
+| "M" | "%-M" | 4 |
+| "MM" | "%M" | 04 |
+| "S" | "%-S" | 9 |
+| "SS" | "%S" | 09 |