A simple date-time calculator.

Features:

• Datetime in ISO format at input like 2024-08-25T16:48:25+00:00.
• Timestamps like 1724606867.000.
• now keyword. For sake of simplicity, the "now" time is rounded to seconds.
• Arithmetic on time deltas, like now + 1d - 2m - 1s.
• Brackets: now - (1d + 2m).
• Arithmetic on times and sub-expressions: now + (2000-01-01T01:00:00Z - 2000-01-01T00:00:00Z).
• Built-in functions: full_day and full_hour, like full_day(now).

Usage:

% ./tscalc -- 'full_day(now) + (2000-01-01T00:00:00Z - 1234567890.000) + 1d - 2h - 3s'
2015-07-12T22:28:27+00:00

It is a rewrite of a similar toy tool in Go.

make release

Find the binary in:

./target/release/tscalc

Generate a sequence of times separated by minute in custom format:

seq 1440 | while read d; do tscalc -f %F-%H-%M -- "2024-06-01T00:00:00Z + ${d}m"; done 

• Dates like 2024-01-01 are not recognised.
• 1ms Gives parse error