Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/deevsdeevs/agent-system/datetimenpx skills add DeevsDeevs/agent-system --skill datetimegit clone --depth 1 https://github.com/DeevsDeevs/agent-systemWhat it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00042 | $0.00825 |
| Opus 5 | $0.00021 | $0.00413 |
| Sonnet 5 | $0.00008 | $0.00165 |
| Haiku 4.5 | $0.00004 | $0.00082 |
Grade A, and why
datetime scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 87 lines — stays where its author put it; the contents beside it link to each section on GitHub.
datetime - Current Date & Time
Get the current date and time in various formats.
Quick Reference
# Date only
date +%Y-%m-%d # 2025-01-15
date +%Y/%m/%d # 2025/01/15
date +%d-%m-%Y # 15-01-2025
# Date with time
date +"%Y-%m-%d %H:%M:%S" # 2025-01-15 14:30:45
date +"%Y-%m-%dT%H:%M:%S" # 2025-01-15T14:30:45 (ISO 8601)
date -u +"%Y-%m-%dT%H:%M:%SZ" # 2025-01-15T14:30:45Z (UTC ISO 8601)
# Time only
date +%H:%M:%S # 14:30:45
date +%H:%M # 14:30
date +%I:%M%p # 02:30PM (12-hour)
# Timestamps
date +%s # 1705329045 (Unix epoch)
date +%s%3N # 1705329045123 (milliseconds)
# Human readable
date "+%B %d, %Y" # January 15, 2025
date "+%A, %B %d, %Y" # Wednesday, January 15, 2025
date "+%b %d %Y" # Jan 15 2025
# File-safe formats (no colons/spaces)
date +%Y%m%d # 20250115
date +%Y%m%d_%H%M%S # 20250115_143045
date +%Y%m%d-%H%M%S # 20250115-143045
When to Use
Use this skill whenever you need:
- Current date for logging or timestamps
- Date strings for file naming
- ISO 8601 formatted dates for APIs
- Unix timestamps for calculations
- Human-readable date displays
- UTC time for cross-timezone consistency
Format Codes
| Code | Output | Example |
|---|---|---|
%Y |
Year (4-digit) | 2025 |
%m |
Month (01-12) | 01 |
%d |
Day (01-31) | 15 |
%H |
Hour 24h (00-23) | 14 |
%M |
Minute (00-59) | 30 |
%S |
Second (00-59) | 45 |
%I |
Hour 12h (01-12) | 02 |
%p |
AM/PM | PM |
%s |
Unix timestamp | 1705329045 |
%A |
Weekday name | Wednesday |
%B |
Month name | January |
%b |
Month abbrev | Jan |
%Z |
Timezone | PST |
Common Patterns
Log timestamp:
echo "[$(date +"%Y-%m-%d %H:%M:%S")] Event occurred"
Backup file naming:
cp file.txt "file_$(date +%Y%m%d_%H%M%S).txt"
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 2d ago First seen · 87 lines · 42 tokens per session scan A 6c42f7593a97
datetime is a skill published in the GitHub repository DeevsDeevs/agent-system (40 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 42 tokens to every session and 825 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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