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Four German Holidays Hang Off One Number
Part two of a two-part series on computing public holidays in Delphi — the Gauss/Meeus Easter algorithm in fifteen lines, the four German holidays derived from it by simple offsets, and merging two national calendars into one with the rules-as-data structure from Part 1.
- Delphi
- DateUtils
- Date and Time
- RTL
- Object Pascal
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See all 93 →Two Countries, Twenty Holidays, One Data Structure
Every business application eventually needs to know whether a given day is a working day. Payroll needs it. Delivery-date estimates need it. Anything that computes an SLA in business days needs it. And the first version of that code, in…
- Delphi
- DateUtils
- Date and Time
- RTL
- Object Pascal
Regular Expressions in Delphi, Part 2: Using TRegEx
In Part 1 we learned to read regular expressions — the dozen metacharacters that turn \d{5} into "exactly five digits" and ^…$ into "the whole string, nothing more." That was deliberately code-free, so the concepts had room to land. Now we…
- Delphi
- Regular Expressions
- RTL
- Strings
- Object Pascal
My Server Was Compromised — and Recovery Took One Command
The site was down, so I did what anyone does: I opened a terminal and started looking. What I found was a process called kmod-cache-update, which sounds like something the kernel would run and is in fact XMRig, an open-source Monero miner,…
- Docker
- Security
- Caddy
- Backups
Regular Expressions in Delphi, Part 1: Reading the Squiggles
Every developer has met a regular expression in the wild and quietly flinched. Something like this: It looks less like code and more like the cat walked across the keyboard. And for a long time in the Delphi world you could get away with…
- Delphi
- Regular Expressions
- RTL
- Strings
- Object Pascal
JSON to Delphi Classes: The Popular Version Isn't the Live One
A few days ago a message came in through the contact form on this site. Jens Borrisholt had been reading the JSON and RTTI posts and thought one of his open-source projects might be a fit: a tool that takes an arbitrary JSON document and…
- Delphi
- JSON
- RTTI
- Open Source
RTTI Part 3: Invoking Methods — and a Real Tool
We've come a long way. Part 1 explained what RTTI is — reflection, code that inspects types it didn't know at compile time — and introduced TRttiContext and TValue. Part 2 read an object's properties, fields, and attributes, and wrote…
- Delphi
- RTTI
- Reflection
- RTL
- Object Pascal
02 — The archive
86 more articles, back to 2023.
Every article ever published, grouped by year and month.