YAML & TOML Date Format Converter
YAML and TOML both define native timestamp types: date-only (`2026-08-13`), local datetime (`2026-08-13T14:30:00`), and offset/UTC datetime (`2026-08-13T14:30:00Z` or `+00:00`). Parsers treat these as typed values, not strings, so format details matter.
This converter renders your date-time in each YAML/TOML timestamp shape so you can write config files that parse into the intended date type.
YAML & TOML Date Format Converter Quick Reference
| Format | Pattern / Description | Example 1 | Example 2 |
|---|---|---|---|
| YAML Timestamp | Canonical format | 2026-08-13T14:30:00.000Z | 2026-01-01T00:00:00.000Z |
| YAML Timestamp (Offset) | With Offset | 2026-08-13T14:30:00Z | 2026-01-01T00:00:00Z |
| YAML Timestamp (UTC) | Canonical | 2026-08-13T14:30:00.000Z | 2026-01-01T00:00:00.000Z |
| TOML Date | RFC 3339 | 2026-08-13T14:30:00.000Z | 2026-01-01T00:00:00.000Z |
* Examples are rendered in UTC for the fixed sample instants above.
When to Use YAML & TOML Date Format
Config file authoring
Write `expires_at: 2026-08-13T14:30:00Z` in a format your YAML/TOML parser recognizes as a datetime, not a string.
CI & IaC configuration
Terraform, GitHub Actions and Ansible parse timestamp fields; verify values match the required type (date vs datetime vs offset).
Cross-language parsing
Confirm the timestamp string parses identically in Python (PyYAML), Go (yaml.v3) and Rust (serde_yaml) consumers.
Frequently Asked Questions
What is a YAML timestamp type?
YAML 1.1 `timestamp` type matches `YYYY-MM-DD` (date), `YYYY-MM-DDTHH:mm:ss` (local), and `...Z`/`...±HH:MM` (UTC/offset). Parsers return native date objects.
What is the TOML datetime format?
TOML uses RFC 3339: `2026-08-13` (local date), `2026-08-13T14:30:00` (local datetime), `2026-08-13T14:30:00Z` (offset datetime) or `2026-08-13T14:30:00+02:00`.
What is the difference between local and offset datetime?
Local datetime has no zone and is interpreted in the reader's context; offset/UTC datetime pins the instant absolutely. For configs, offsets avoid ambiguity.
Will YAML treat my date as a string?
If the value is quoted (`"2026-08-13"`) it is a string; unquoted it becomes a typed date. This distinction changes behavior in schemas and validators.
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