Timestamps

The Lemma API uses ISO 8601 timestamps for all date and time values. This is the most widely supported timestamp format across programming languages and tools.

Format

An ISO 8601 timestamp looks like this:

2026-03-15T14:30:00Z

Part	Meaning
`2026-03-15`	Date in year-month-day order
`T`	Separator between date and time
`14:30:00`	Time in 24-hour format (hours:minutes:seconds)
`Z`	UTC timezone (also called “Zulu”)

Timezone offsets

Instead of Z, you can specify a UTC offset:

2026-03-15T09:30:00-05:00

This represents 9:30 AM Eastern Standard Time (UTC-5). The API converts all timestamps to UTC internally.

Using timestamps in query parameters

When filtering by timestamp, pass the full ISO 8601 string as the parameter value:

curl "https://api.getlemma.com/v0/transactions?posted_at.on_or_after=2026-03-01T00:00:00Z&posted_at.on_or_before=2026-03-31T23:59:59Z" \
  -H "Authorization: Bearer your_api_key"

Generating timestamps

JavaScript
Python
Ruby
cURL

new Date().toISOString()
// "2026-03-15T14:30:00.000Z"

from datetime import datetime, timezone

datetime.now(timezone.utc).isoformat()
# "2026-03-15T14:30:00+00:00"

Time.now.utc.iso8601
# "2026-03-15T14:30:00Z"

date -u +"%Y-%m-%dT%H:%M:%SZ"
# 2026-03-15T14:30:00Z

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Getting started

Concepts

Entities

Bank Accounts

Lockbox

Check deposits

Reconciliation

Transactions

External accounts

Book transfers

ACH transfers

Format

Timezone offsets

Using timestamps in query parameters

Generating timestamps

​Format

​Timezone offsets

​Using timestamps in query parameters

​Generating timestamps

Format

Timezone offsets

Using timestamps in query parameters

Generating timestamps